Extra Spare container for GL 90 composting toilet. Having an extra spare container increases the use capacity of your GL 90 composting toilet. With spare containers, the service of the GL 90 toilet is easy, fast and clean. The waste turns in to ready compost inside the spare container.
Please note that any new GL 90 composting toilet packages already include one spare container. Purchasing the extra spare container will add up to your existing number of spare container(s).
Available in USA
In stock: 8 pcs
GL 90 Extra Spare Container
GL 90 spare container increases the capacity of GL 90 composting toilet. In seasonal family use, usually one spare container supplied with the basic package is enough. In continuous use, more containers may be needed. GL 90 system can have unlimited capacity with spare containers. When using the spare container, you don´t have to handle any raw toilet waste. All you need to do, is simply switch a full container with an empty spare, and the full container can be left outside for further composting. By the time all GL 90 composting toilet containers are full, the first one in use should be ready with compost that can be safely used as a fertilizer e.g. in your garden.
Please note that any new GL 90 composting toilet package already includes a single spare container, so if you are buying the GL 90 composting toilet + an extra spare container, you will receive three GL 90 composting toilet containers in total: one container with open lid and two containers with closed lids.
Use of Extra Spare Container
When the active GL 90 container reaches capacity, it is be replaced with an empty spare container, which is then sealed with its own lid. Subsequently, the toilet’s waste shaft lid is attached to the new container, making it ready for use.
Complete decomposition of the waste within the container typically takes 6 to 18 months, varying with local climate conditions and other environmental factors. For optimal composting, it’s advisable to place the full container in a sunny location. Periodically aerating the compost with a garden fork for example can also enhance the process. The container can withstand freezing temperatures without any damage to the composting container itself.
Each new GL 90 composting toilet system includes one spare container. Adding extra spare container to your setup extends the system’s capacity.
Delivery Contents:
GL 90 Composting Container
Closed Lid
Mesh Net Cap
Cap
GL 90 Extra Spare Container
GL 90 spare container increases the capacity of GL 90 composting toilet. In seasonal family use, usually one spare container supplied with the basic package is enough. In continuous use, more containers may be needed. GL 90 system can have unlimited capacity with spare containers. When using the spare container, you don´t have to handle any raw toilet waste. All you need to do, is simply switch a full container with an empty spare, and the full container can be left outside for further composting. By the time all GL 90 composting toilet containers are full, the first one in use should be ready with compost that can be safely used as a fertilizer e.g. in your garden.
Please note that any new GL 90 composting toilet package already includes a single spare container, so if you are buying the GL 90 composting toilet + an extra spare container, you will receive three GL 90 composting toilet containers in total: one container with open lid and two containers with closed lids.
Use of Extra Spare Container
When the active GL 90 container reaches capacity, it is be replaced with an empty spare container, which is then sealed with its own lid. Subsequently, the toilet’s waste shaft lid is attached to the new container, making it ready for use.
Complete decomposition of the waste within the container typically takes 6 to 18 months, varying with local climate conditions and other environmental factors. For optimal composting, it’s advisable to place the full container in a sunny location. Periodically aerating the compost with a garden fork for example can also enhance the process. The container can withstand freezing temperatures without any damage to the composting container itself.
Each new GL 90 composting toilet system includes one spare container. Adding extra spare container to your setup extends the system’s capacity.
Delivery Contents:
GL 90 Composting Container
Closed Lid
Mesh Net Cap
Cap
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Craig
I was very pleased with the composting toilet system. It worked perfectly this whole summer. It was used for the cabin on our ranch. My son and I built the cabin so installing this was quite simple. The one concern I have would be for people who are not as adept as we are. It was with the instructions. There should be two different instructions sets for the different hole sizes of the toilet through the floor hole. The other suggestion would be to provide the cap to be in inches not mm. The 4 in pipe did not directly fit. I was 2 hours away from a store to get a rubber sleeve and cut slits in the 4 in pipe to fit the cap. It worked perfectly. I ordered the whirlybird in case I needed it but the fan worked just fine. All in all, I couldn't have been more pleased. Here are photos of the installation. The pod is under the cabin but you see where it comes into the piping.
Craig
I was very pleased with the composting toilet system. It worked perfectly this whole summer. It was used for the cabin on our ranch. My son and I built the cabin so installing this was quite simple. The one concern I have would be for people who are not as adept as we are. It was with the instructions. There should be two different instructions sets for the different hole sizes of the toilet through the floor hole. The other suggestion would be to provide the cap to be in inches not mm. The 4 in pipe did not directly fit. I was 2 hours away from a store to get a rubber sleeve and cut slits in the 4 in pipe to fit the cap. It worked perfectly. I ordered the whirlybird in case I needed it but the fan worked just fine. All in all, I couldn't have been more pleased. Here are photos of the installation. The pod is under the cabin but you see where it comes into the piping.
Craig
I was very pleased with the composting toilet system. It worked perfectly this whole summer. It was used for the cabin on our ranch. My son and I built the cabin so installing this was quite simple. The one concern I have would be for people who are not as adept as we are. It was with the instructions. There should be two different instructions sets for the different hole sizes of the toilet through the floor hole. The other suggestion would be to provide the cap to be in inches not mm. The 4 in pipe did not directly fit. I was 2 hours away from a store to get a rubber sleeve and cut slits in the 4 in pipe to fit the cap. It worked perfectly. I ordered the whirlybird in case I needed it but the fan worked just fine. All in all, I couldn't have been more pleased. Here are photos of the installation. The pod is under the cabin but you see where it comes into the piping.
Craig
I was very pleased with the composting toilet system. It worked perfectly this whole summer. It was used for the cabin on our ranch. My son and I built the cabin so installing this was quite simple. The one concern I have would be for people who are not as adept as we are. It was with the instructions. There should be two different instructions sets for the different hole sizes of the toilet through the floor hole. The other suggestion would be to provide the cap to be in inches not mm. The 4 in pipe did not directly fit. I was 2 hours away from a store to get a rubber sleeve and cut slits in the 4 in pipe to fit the cap. It worked perfectly. I ordered the whirlybird in case I needed it but the fan worked just fine. All in all, I couldn't have been more pleased. Here are photos of the installation. The pod is under the cabin but you see where it comes into the piping.
Mary T.
Easy installation and no bad smell. I feels and looks like a regular flushing toilet.
Mary T.
Easy installation and no bad smell. I feels and looks like a regular flushing toilet.
Gerald
My son and I own a wooded piece of property in northern Michigan with a travel trailer. We wanted to avoid constantly taking the trailer to a dumping station when the black water tank got full, so we decided to build a small outbuilding for a composting toilet.
After searching online for a solution that would suit our needs, we found the Waterless Toilet. The price, engineering, and comprehensive instructions were exactly what we were looking for.
We followed the instructions and installed the toilet in our outbuilding. The porcelain toilet is a great feature—it looks very clean and professional. The height and seat are comfortable, it is very easy to use, and there is absolutely no odor. We are completely satisfied with our purchase.
Gerald
My son and I own a wooded piece of property in northern Michigan with a travel trailer. We wanted to avoid constantly taking the trailer to a dumping station when the black water tank got full, so we decided to build a small outbuilding for a composting toilet.
After searching online for a solution that would suit our needs, we found the Waterless Toilet. The price, engineering, and comprehensive instructions were exactly what we were looking for.
We followed the instructions and installed the toilet in our outbuilding. The porcelain toilet is a great feature—it looks very clean and professional. The height and seat are comfortable, it is very easy to use, and there is absolutely no odor. We are completely satisfied with our purchase.
Gerald
My son and I own a wooded piece of property in northern Michigan with a travel trailer. We wanted to avoid constantly taking the trailer to a dumping station when the black water tank got full, so we decided to build a small outbuilding for a composting toilet.
After searching online for a solution that would suit our needs, we found the Waterless Toilet. The price, engineering, and comprehensive instructions were exactly what we were looking for.
We followed the instructions and installed the toilet in our outbuilding. The porcelain toilet is a great feature—it looks very clean and professional. The height and seat are comfortable, it is very easy to use, and there is absolutely no odor. We are completely satisfied with our purchase.
Gerald
My son and I own a wooded piece of property in northern Michigan with a travel trailer. We wanted to avoid constantly taking the trailer to a dumping station when the black water tank got full, so we decided to build a small outbuilding for a composting toilet.
After searching online for a solution that would suit our needs, we found the Waterless Toilet. The price, engineering, and comprehensive instructions were exactly what we were looking for.
We followed the instructions and installed the toilet in our outbuilding. The porcelain toilet is a great feature—it looks very clean and professional. The height and seat are comfortable, it is very easy to use, and there is absolutely no odor. We are completely satisfied with our purchase.
I was very pleased with the composting toilet system. It worked perfectly this whole summer. It was used for the cabin on our ranch. My son and I built the cabin so installing this was quite simple. The one concern I have would be for people who are not as adept as we are. It was with the instructions. There should be two different instructions sets for the different hole sizes of the toilet through the floor hole. The other suggestion would be to provide the cap to be in inches not mm. The 4 in pipe did not directly fit. I was 2 hours away from a store to get a rubber sleeve and cut slits in the 4 in pipe to fit the cap. It worked perfectly. I ordered the whirlybird in case I needed it but the fan worked just fine. All in all, I couldn’t have been more pleased. Here are photos of the installation. The pod is under the cabin but you see where it comes into the piping.
My son and I own a wooded piece of property in northern Michigan with a travel trailer. We wanted to avoid constantly taking the trailer to a dumping station when the black water tank got full, so we decided to build a small outbuilding for a composting toilet.
After searching online for a solution that would suit our needs, we found the Waterless Toilet. The price, engineering, and comprehensive instructions were exactly what we were looking for.
We followed the instructions and installed the toilet in our outbuilding. The porcelain toilet is a great feature—it looks very clean and professional. The height and seat are comfortable, it is very easy to use, and there is absolutely no odor. We are completely satisfied with our purchase.
Life changer.
Been living off grid so you can imagine what that is like when it’s time to go.
I researched it felt like 100’s of toilets and I kept coming back to this one and I am glad I did!
My husband and I were skeptical when we first put it in thinking “ ok, it’s going to be nice to be able to do our business indoors but we will have to figure out what to do for the smell” to our surprise and delight there is absolutely no smell! We bought the upgraded pedestal and from my research that is a big plus and the right ventilation system. I would recommend this product to anyone that lives off grid or any other place that has septic or water challenges
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Scott C.
Verified owner
4/5
I purchased the replacement fan old 1 still working
I was very pleased with the composting toilet system. It worked perfectly this whole summer. It was used for the cabin on our ranch. My son and I built the cabin so installing this was quite simple. The one concern I have would be for people who are not as adept as we are. It was with the instructions. There should be two different instructions sets for the different hole sizes of the toilet through the floor hole. The other suggestion would be to provide the cap to be in inches not mm. The 4 in pipe did not directly fit. I was 2 hours away from a store to get a rubber sleeve and cut slits in the 4 in pipe to fit the cap. It worked perfectly. I ordered the whirlybird in case I needed it but the fan worked just fine. All in all, I couldn't have been more pleased. Here are photos of the installation. The pod is under the cabin but you see where it comes into the piping.
Average Daily Capacity per 26-Gallon Composting Bin
(Based on approx. 150 uses involving a #2 — i.e., poop) – only the solids count!
Service Interval
#2 Visits per Day (involving a #2)
30 days (1 month)
~5.0 visits/day
60 days (2 months)
~2.5 visits/day
90 days (3 months)
~1.7 visits/day
180 days (6 months)
~0.8 visits/day
365 days (1 year)
~0.4 visits/day
👥 Roughly how often will I service a bin?
Full-Time Users
Time Before a Bin Swap
1 person
about 4–5 months
2 people
about 2–3 months
3 people
about 1.5–2 months
4 people
about 1–2 months
🟢 What counts as a “#2 visit”?
Only visits that involve pooping (i.e., going number two) — urine-only visits don’t contribute to filling the composting bin and are not included in the estimate.
🔄 Why two bins?
The Green Toilet Compact Lux comes with two composting bins. The figures above are per bin: when one fills up you swap in the empty one, and the full bin is left to compost undisturbed until you next need it. The second bin doesn’t make the interval longer — it means you never have to empty a bin in a hurry. Additional bins can be added at any time.
⚠️ Disclaimer: These estimates are approximations. The actual number of solid uses per bin may vary significantly depending on climate, temperature, ventilation, user habits, and the amount of dry bulking material (e.g., wood shavings or peat) added after each use.
Our Customer Service team is currently closed on Thursday, June 11th, 2026 and will be back on Friday, June 12th, 2026.
Our phone customer service is closed today Friday, July 3rd 2026. We are back on Monday next week.
Email customer service remains available — please contact us at info@waterlesstoiletshop.com
, and we’ll get back to you as soon as possible.
Thank you for your understanding.
Pay with Klarna
We’re excited to now offer Klarna as a payment option at Waterless Toilet Shop!
Choose how you want to pay — all at once or with flexible installments that fit your budget.
💸 Pay in 4 — Interest-Free
Split your composting toilet purchase into four equal payments every two weeks.
No interest, no hidden fees — just a smarter way to pay over time.
Other Flexible Options
Klarna also offers monthly financing with 6–24-month plans and transparent APR rates based on your credit.
You’ll see all available payment options instantly when you select Klarna at checkout.
Klarna financing is issued by WebBank and available to eligible U.S. residents in most states.
Missed payments may incur late fees. For California residents, loans are made or arranged pursuant to a California Financing Law license. Review Klarna’s terms.
CF 8 Composting Toilet – Estimated Daily Capacity
The CF 8 is a continuous composting toilet system featuring a single large 250-gallon container. Like the CF 4, it is designed for gradual emptying rather than batch-style use. Solids are typically removed in thirds or sections, allowing earlier deposits time to fully compost inside the tank.
This setup allows for either:
Year-round use with gradual emptying, or
Seasonal use (e.g., 4–5 months/year) with full emptying once per year
🔁 Continuous Use: Gradual Emptying in Thirds
When used year-round, the CF 8 is typically emptied one-third at a time, effectively composting in three rotating “piles” within the container.
Because the CF 8 is more than twice as large as the CF 4, each pile can hold approximately 480–960 poops, depending on composting conditions and how much bulking material is used.
Service Interval (per pile)
Estimated #2 Visits per Day
30 days (1 month)
~17–32 visits/day
60 days (2 months)
~8–16 visits/day
90 days (3 months)
~5–11 visits/day
180 days (6 months)
~3–5 visits/day
365 days (1 year)
~1.2–2.6 visits/day
💡 These figures assume that one-third of the tank is in active use at a time, with older waste given time to compost before removal.
🌤 Seasonal Use: Full-Tank Emptying After Inactive Period
For cabins, cottages, or other sites used seasonally, the CF 8 can be used for a few months and then left idle to allow full composting. In such cases, the entire tank may be emptied once a year.
Full-tank capacity estimate: ~1,440–2,880 poops
Example: 120 days of use (approx. 4 months): → ~12–24 solid visits per day on average
⚠️ Disclaimer
These numbers are rough estimates based on typical use and conditions. Actual capacity will vary depending on:
Climate (temperature and humidity)
Ventilation and air flow
How much dry bulking material is added
User behavior and emptying practices
For best performance, ensure proper aeration, regular bulking material use, and consistent emptying of composted portions.
💡 Want to Maximize Capacity? Consider a Urine-Diverting Toilet — With Some Important Considerations
If you’re looking to maximize the capacity of the CF 8 system — aiming for 960+ poops per composting “pile” — we recommend using aurine-diverting (UD) toilet pedestal.
✅ Benefits of Urine Separation:
Reduces or eliminates the need for dry bulking material, which frees up valuable space in the composting unit
Helps keep the compost drier, more aerated, and better suited for natural decomposition
Increases the total capacity of the composting container
Can lead to faster and more efficient composting, especially in high-use environments
By diverting urine out of the solids container, the volume taken up by absorbent material (like peat or wood shavings) is significantly reduced. This can make a big difference in how often the system needs to be emptied.
⚠️ Downsides to Consider:
Urine-diverting toilets can take some time to get used to. Users need to sit or aim correctly to ensure proper separation, which might not happen consistently without experience or guidance.
For this reason, UD toilets are generally not ideal for public or commercial settings where the toilet is used by guests, tourists, or other first-time users. In these cases, misuse can reduce the effectiveness of the system and may even lead to unpleasant maintenance issues.
In short: A UD toilet is an excellent choice for maximizing capacity in private or family use, but for guest or public access composting toilets, a standard non-diverting model may be more practical and user-friendly.
Green Toilet 100 Easy – Estimated Daily Capacity
The Green Toilet 100 Easyis a compact and user-friendly batch composting toilet with a 26-gallon composting container. Its design makes it well-suited for outhouses, cabins, and even indoor use. A spare containeris available to expand capacity and simplify servicing.
Note: Due to the shape and internal structure of the container, the actual composting capacity is slightly lower than its raw volume might suggest, if you compare with Green Toilet 120 Family composting toilet for example.
📆 Average Daily Capacity per Bin
Service Interval
Estimated #2 Visits per Day
30 days (1 month)
~6–7 visits/day
60 days (2 months)
~3–4 visits/day
90 days (3 months)
~2.2 visits/day
180 days (6 months)
~1.1 visits/day
365 days (1 year)
~0.5 visits/day
Notes & Recommendations:
For seasonal or weekend use, one container often lasts a full summer.
For more frequent use, we recommend the package with a spare container. This allows one bin to rest and compost while the other is in active use.
Don’t forget to add dry bulking material (like wood shavings or peat) regularly to maintain airflow and prevent odors.
⚠️ Disclaimer: These estimates are intended as general guidance. Real-world performance may vary depending on:
Climate and temperature
Ventilation quality
How much dry bulking material is used
Number of users and usage patterns
CF 4 Composting Toilet – Estimated Daily Capacity
The CF 4 is a continuous composting toilet system featuring a single large 105-gallon container. Unlike batch composting systems (such as the Green Toilet models), the CF 4 is designed for gradual emptying — solids are typically removed in thirds or sections, allowing earlier deposits time to fully compost inside the tank.
This setup allows for either:
Year-round use with gradual emptying, or
Seasonal use (e.g. 4–5 months/year) with full emptying once per year
🔁 Continuous Use: Gradual Emptying in Thirds
When used year-round, the CF 4 is typically emptied one-third at a time, effectively composting in three rotating “piles” within the container. Depending on composting conditions and how much bulking material is used, each pile can hold approximately 200–400 poops.
Service Interval (per pile)
Estimated #2 Visits per Day
30 days (1 month)
~7–13 visits/day
60 days (2 months)
~3–7 visits/day
90 days (3 months)
~2–4 visits/day
180 days (6 months)
~1–2 visits/day
365 days (1 year)
~0.5–1.1 visits/day
💡 These figures assume that one third of the tank is in active use at a time, with older waste given time to compost before removal.
🌤 Seasonal Use: Full-Tank Emptying After Inactive Period
For cabins, cottages, or other sites used seasonally, the CF 4 can be used for a few months and then left idle to allow full composting. In such cases, the entire tank may be emptied once a year.
Full-tank capacity estimate: ~600–1,200 poops
Example: 120 days of use (approx. 4 months): → ~5–10 solid visits per day on average
⚠️ Disclaimer
These numbers are rough estimates based on typical use and conditions. Actual capacity will vary depending on:
Climate (temperature and humidity)
Ventilation and air flow
How much dry bulking material is added
User behavior and emptying practices
For best performance, ensure proper aeration, regular bulking material use, and consistent emptying of composted portions.
💡 Want to Maximize Capacity? Consider a Urine-Diverting Toilet — With Some Important Considerations
If you’re looking to maximize the capacity of the CF 4 system — aiming for 400+ poops per composting “pile” — we recommend using a urine-diverting (UD) toilet pedestal.
✅ Benefits of Urine Separation:
Reduces or eliminates the need for dry bulking material, which frees up valuable space in the composting unit
Helps keep the compost drier, more aerated, and better suited for natural decomposition
Increases the total capacity of the composting container
Can lead to faster and more efficient composting, especially in high-use environments
By diverting urine out of the solids container, the volume taken up by absorbent material (like peat or wood shavings) is significantly reduced. This can make a noticeable difference in how often the system needs to be emptied.
⚠️ Downsides to Consider:
Urine-diverting toilets can take some time to get used to. Users need to sit or aim correctly to ensure proper separation, which might not happen consistently without experience or guidance.
For this reason, UD toilets are generally not ideal for public or commercial settings where the toilet is used by guests, tourists, or other first-time users. In these cases, misuse can reduce the effectiveness of the system and may even lead to unpleasant maintenance issues.
In short: A UD toilet is an excellent choice for maximizing capacity in private or family use, but for guest or public access composting toilets, a standard non-diverting model may be more practical and user-friendly.
Green Toilet 120 Family
💩 Average Daily Capacity per 31-Gallon Composting Bin
(Based on approx. 356 uses involving a #2 — i.e., poop) – only the solids count!
Service Interval
#2 Visits per Day (involving a #2)
30 days (1 month)
~11.9 visits/day
60 days (2 months)
~5.9 visits/day
90 days (3 months)
~4.0 visits/day
180 days (6 months)
~2.0 visits/day
365 days (1 year)
~1.0 visits/day
🟢 What counts as a “#2 visit”? Only visits that involve pooping (i.e., going number two) — urine-only visits don’t contribute to filling the composting bin and are not included in the estimate.
⚠️ Disclaimer: These estimates are approximations. The actual number of solid uses per bin may vary significantly depending on climate, temperature, ventilation, user habits, and the amount of dry bulking material (e.g., wood shavings or peat) added after each use.
Green Toilet 330
💩 Average Daily Capacity per 87-Gallon Composting Bin
(Based on approx. 1,000 uses involving a #2 — i.e., poop) – only the solids count!
Service Interval
#2 Visits per Day (involving pooping)
30 days (1 month)
~33 visits/day
60 days (2 months)
~17 visits/day
90 days (3 months)
~11 visits/day
180 days (6 months)
~5.6 visits/day
365 days (1 year)
~2.7 visits/day
🟢 What counts as a “#2 visit”? Only visits that involve defecation (pooping) — urine-only visits don’t fill up the composting bin and are not included in the 1,000-use estimate.
⚠️ Disclaimer: These estimates are based on typical, steady use. The actual number of solid uses a composting bin can handle may vary significantly depending on climate, temperature, humidity, ventilation, and how much dry bulking material (like wood shavings) is added after each use.
💧 Liquid waste (urine) estimate
Average person produces about:
0.4 gallons of urine per day (≈1.5 liters ≈ 1.6 quarts)
So for 100 people:
0.4 gallons × 100 = 40 gallons of urine per day
🚽 Flush water use estimate
Average flush volume in the U.S. is about:
1.5 gallons per flush
Average person flushes ~5 times per day, so:
1.5 gallons × 5 = 7.5 gallons/person/day
So for 100 people:
7.5 gallons × 100 = 750 gallons of flush water per day
I was very pleased with the composting toilet system. It worked perfectly this whole summer. It was used for the cabin on our ranch. My son and I built the cabin so installing this was quite simple. The one concern I have would be for people who are not as adept as we are. It was with the instructions. There should be two different instructions sets for the different hole sizes of the toilet through the floor hole. The other suggestion would be to provide the cap to be in inches not mm. The 4 in pipe did not directly fit. I was 2 hours away from a store to get a rubber sleeve and cut slits in the 4 in pipe to fit the cap. It worked perfectly. I ordered the whirlybird in case I needed it but the fan worked just fine. All in all, I couldn’t have been more pleased. Here are photos of the installation. The pod is under the cabin but you see where it comes into the piping.
Easy installation and no bad smell. I feels and looks like a regular flushing toilet.
My son and I own a wooded piece of property in northern Michigan with a travel trailer. We wanted to avoid constantly taking the trailer to a dumping station when the black water tank got full, so we decided to build a small outbuilding for a composting toilet.
After searching online for a solution that would suit our needs, we found the Waterless Toilet. The price, engineering, and comprehensive instructions were exactly what we were looking for.
We followed the instructions and installed the toilet in our outbuilding. The porcelain toilet is a great feature—it looks very clean and professional. The height and seat are comfortable, it is very easy to use, and there is absolutely no odor. We are completely satisfied with our purchase.
Seems to work well. We ordered extra due to a family of 4, so far one tub has lasted 4 months
Life changer.
Been living off grid so you can imagine what that is like when it’s time to go.
I researched it felt like 100’s of toilets and I kept coming back to this one and I am glad I did!
My husband and I were skeptical when we first put it in thinking “ ok, it’s going to be nice to be able to do our business indoors but we will have to figure out what to do for the smell” to our surprise and delight there is absolutely no smell! We bought the upgraded pedestal and from my research that is a big plus and the right ventilation system. I would recommend this product to anyone that lives off grid or any other place that has septic or water challenges