The complete composting solution for small composting toilets.
The Toilet Waste Composter is where your small composting toilet’s waste goes to finish the job. Designed to pair with any small or DIY self-contained composting toilet, it gives you a place to empty your unit and let the waste fully compost — safely, hygienically, and without odour. Featuring a double-base design that separates liquids from solids, an included 5-gallon liquid container, and wheels for easy moving when it’s time to empty the finished compost.
Built on the same proven principle as our flagship Green Toilet 330 batch composting system.
In stock: 2 pcs
Toilet Waste Composter
Finally, somewhere to empty your small composting toilet
If you own a small self-contained composting toilet — whether it's a commercial unit, a DIY build, or another brand's portable model — you already know the catch: these toilets fill up, and the waste inside isn't yet fully composted when you need to empty them. So where does it go?
The Toilet Waste Composter is built specifically to answer that question.
It's not a composting toilet itself. It's the second stage of your composting system — a robust, wheeled container where you empty your small toilet's contents and let nature finish the work. The result: properly composted, garden-safe material, with none of the mess, odour, or guesswork of trying to compost toilet waste in an ordinary bin.
How it works
The Toilet Waste Composter uses the same trusted batch-composting principle as our Green Toilet 330 system. You empty your small composting toilet into the container, add a bit of bulking material (peat, sawdust, or compost mix), and close the lid. Inside, the double-base design separates excess liquid from the solids — keeping the compost mass at the right moisture level for aerobic decomposition, which is what eliminates odour and pathogens.
Excess liquid drains through a side outlet into the included 5-gallon (≈20 L) jerry can, which you can empty into a soakaway, dilute and use as fertiliser, or dispose of according to your local regulations.
When the container is full, you simply leave it to finish composting and let nature do the rest. For seasonal use — a summer cottage, for example — a single container is usually enough. If you use your composting toilet year-round, you’ll want a second container (sold separately) so one batch can finish composting undisturbed while the other is in active use. When the compost is mature, wheel the unit to your garden or compost heap and tip it out.
What’s in the box
1 × Composting container with lid and ventilation pipe
Drain outlet and hose
1 × 5-gallon (≈20 L) liquid collection jerry can
Wheels and handle for easy moving
Tip: most customers eventually add a second container so one batch can finish composting undisturbed while the other is in active use — the same two-bin rotation that comes standard with the Green Toilet 330.
Who it’s for
Owners of small self-contained composting toilets (any brand) who need a permanent solution for emptied waste
DIY composting toilet builders who’ve solved the toilet but not the “what next” problem
Off-grid cabins, tiny houses, allotments, summer cottages, boats, and workshops
Anyone who wants the composting capacity of a larger system without replacing their existing toilet
Toilet Waste Composter
Finally, somewhere to empty your small composting toilet
If you own a small self-contained composting toilet — whether it's a commercial unit, a DIY build, or another brand's portable model — you already know the catch: these toilets fill up, and the waste inside isn't yet fully composted when you need to empty them. So where does it go?
The Toilet Waste Composter is built specifically to answer that question.
It's not a composting toilet itself. It's the second stage of your composting system — a robust, wheeled container where you empty your small toilet's contents and let nature finish the work. The result: properly composted, garden-safe material, with none of the mess, odour, or guesswork of trying to compost toilet waste in an ordinary bin.
How it works
The Toilet Waste Composter uses the same trusted batch-composting principle as our Green Toilet 330 system. You empty your small composting toilet into the container, add a bit of bulking material (peat, sawdust, or compost mix), and close the lid. Inside, the double-base design separates excess liquid from the solids — keeping the compost mass at the right moisture level for aerobic decomposition, which is what eliminates odour and pathogens.
Excess liquid drains through a side outlet into the included 5-gallon (≈20 L) jerry can, which you can empty into a soakaway, dilute and use as fertiliser, or dispose of according to your local regulations.
When the container is full, you simply leave it to finish composting and let nature do the rest. For seasonal use — a summer cottage, for example — a single container is usually enough. If you use your composting toilet year-round, you’ll want a second container (sold separately) so one batch can finish composting undisturbed while the other is in active use. When the compost is mature, wheel the unit to your garden or compost heap and tip it out.
What’s in the box
1 × Composting container with lid and ventilation pipe
Drain outlet and hose
1 × 5-gallon (≈20 L) liquid collection jerry can
Wheels and handle for easy moving
Tip: most customers eventually add a second container so one batch can finish composting undisturbed while the other is in active use — the same two-bin rotation that comes standard with the Green Toilet 330.
Who it’s for
Owners of small self-contained composting toilets (any brand) who need a permanent solution for emptied waste
DIY composting toilet builders who’ve solved the toilet but not the “what next” problem
Off-grid cabins, tiny houses, allotments, summer cottages, boats, and workshops
Anyone who wants the composting capacity of a larger system without replacing their existing toilet
Our phone customer service is closed today.
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