Composting
Off-Grid
Indoors
Self-contained
Tiny House
ADU
Urine-diverting
Year-around
Luxurious
Cabins
RVs
Large capacity
Cold climate
Glamping
Outhouses
Batch toilets
Public use
Continuous
Accessories
GL 90
Batch composting toilet
$1,439.00
Discover waterless sanitation with the GL series. Our innovative GL 90 model offers a sophisticated, split-system design that includes a ceramic toilet and external compost bins. This design not only simplifies the service of the toilet but also significantly enhances user experience.
Each GL unit features a stylish porcelain pedestal that adds elegance to any bathroom space. The GL 90 is perfect for full-time use of 1-3 individuals or part-time use of up to 4 people. The system’s capacity can easily be extended with additional GL 90 composting containers. Each optional spare container purchased adds 1 – 3 people extra to this capacity. This makes the GL 90 ideal for regular use in holiday homes, cabins and tiny houses with limited space below bathroom floor level. The standard package includes two GL 90 composting containers that make the service of the system a breeze.
18" Below clearance required
Shipping from Nevada
Certified Product
GL 90
The GL 90 is a composting toilet that does not require water or electricity to function. Unlike traditional flush toilets, the GL 90 doesn't require flushing. All waste simply falls into and composts within a sub-floor GL 90 composting unit.
This split-system toilet features a stylish porcelain pedestal in the bathroom. It connects to a composting container located below floor level. When full, you simply swap the container with a spare one. This design is perfect for houses with limited space beneath the toilet.
All maintenance is done outdoors, keeping your indoor spaces clean. Using batch composting, servicing the GL 90 is straightforward and clean. When a container fills up, you seal it and leave it to compost. Then, replace it with a fresh one. Once the other container is also full, the compost from the first container is ready humus-like compost that can be reused in gardens or safely disposed of.
The system's capacity can easily be expanded with additional spare containers.
The GL 90 is a certified product Manufactured to: AS/NZS 1546.2:2008 - On-site domestic wastewater treatment units – Waterless composting toilets.
Use of the GL 90
The GL 90 composting toilet operates like a conventional toilet but without the need for flushing. All waste and toilet paper falls directly into the composting container below.
Inside the container, darkness conceals the waste, ensuring no visibility. Additionally, the built-in ventilation system in the composting container eliminates any odors, maintaining a fresh environment above.
After each use, it’s advisable to sprinkle a cupful of covering material, like hemp, over the waste through the toilet seat. You can also opt to add a larger quantity of covering material less often, such as weekly. To enhance the composting process, occasionally stir and level the compost to facilitate a more efficient breakdown.
Please remember not to dispose of plastic items, like sanitary towels, in the composting container. These should be thrown into a separate bin as they are non-compostable.
Installation of the GL 90
There are two main ways to install and service the GL 90 composting toilet. In general the GL 90 composting container has to be installed directly below the toilet pedestal. Depending on clearance height below the floor-level, the toilet can be installed and serviced either in such a way that the container is pulled out all together with the lid and the waste shaft (Option 1), or by leaving the waste shaft and the lid in place (Option 2). The option number 2 is generally more common.
For more information, please refer to the Installation and user manual GL 90
Installation option 1
Installation option 2
Service of the GL 90
When the GL 90 composting container is finally full of solid waste, the full container is pulled out below the bathroom. The full container is then sealed with a closed lid and left outside to undergo further composting process.
The empty(ied) spare container is then put into use, replacing the full container. The use of the toilet can continue right away.
The service can be done in matter of minutes without the need for tools.
Leveling the compost inside with the GL Compost Maximizer
Generally with all composting toilets, solid waste tends to pile up forming a cone shape. To use the full volume of the composting toilet, the pile should be manually rolled over. For this purpose, we offer an optional accessory called Compost Maximizer for the GL 90 . The compost maximizer is essentially a metal leveler that is manually operated by pushing and pulling it outside the GL 90 container.
The compost maximizer is an optional feature. The pile may also be leveled using virtually any stick, shovel or fork, though this may require you to pull the GL 90 container out first. Therefore, the compost maximizer is a handy feature for leveling the compost inside the GL 90 composting container.
Frequently Asked Questions of GL 90 composting toilet
Can I throw toilet paper into the composting container of the GL 90?
Yes, you can safely dispose of toilet paper in the GL 90.
How often do I need to empty the composting container of the GL 90, and how quickly does it fill up?
The frequency at which the composting container fills up varies based on the number of users and other factors such as climate. Generally, the GL 90 supports 2 to 3 people full-time or 4 to 5 people part-time comfortably.
If the usage is higher, it may be advisable to consider obtaining an additional spare container or opting for a system with larger capacity.
How much space is required below the floor for installation of the GL 90?
The GL 90 requires a minimum clearance of 13 inches below the toilet to accommodate the composting container. The GL 90 is one of the most low-profile split-system composting toilets in the market.
Can the pipe to the batch container be extended to a lower level?
Yes, the pipe can easily be extended to allow a drop of up to 10 feet. Even longer drops are possible, depending on the specific situation. We offer waste pipe extensions by the foot in our online store. You’re also welcome to contact us for more details about extending the waste pipe. Click here to see a photo of how the pipe can be extended using our green waste pipe extension.
How much space do the toilet and containers require?
You can find the exact dimensions of the porcelain toilet [click here]. The GL 90 composting bin measures 24″ x 24″ x 18″, which means you’ll need a minimum of 18″ of underfloor space beneath the building. Additionally, the access to underneath must be at least 24″ wide.
If you do not have the space below, please consider our self-contained waterless toilets.
📱(702) 328 0689
✉ info@waterlesstoiletshop.com
Specifications
| Feature | Specification |
|---|---|
| Product | GL 90 |
| Recommended For | Off-Grid Cabins, Tiny Homes, Guest Houses etc. |
| Capacity | 1-3 People Full-Time Use; 2-5 People Part-Time Use |
| Average Daily Visits | 10 |
| Container Length | – |
| Container Width | 24″ |
| Container Height | 18″ + Up To 22″ Chute Extension |
| Container Depth | 24″ |
| Minimum Under Floor Space Requirement | 18″ |
| Volume Per Container | 24 Gallons |
| Container Weight (Empty) | 13 |
| Porcelain Pedestal Weight | 60 lbs |
| Total System Shipping Weight | 118 lbs |
Delivery Contents
- White porcelain pedestal, non-separating, incl. soft-close seat and fixtures
- GL 90 composting container with a waste chute (21.6″)
- GL 90 Spare composting container with a closed lid
- Electrical duct fan
- Ventilation pipe fittings*
- Excess liquids drainage hose & fittings*
- Liquid enzyme cleaner
- Hemp dry material bale
- Instructions for installation and use
*To finish installation, you will need to source ventilation pipes from your local hardware store. Alternatively, you may purchase a ventilation pipe package separately from us.
Optional accessories
- Ventilation Pipe Package
- Extra Spare Container
- Whirlybird*
- Solar Power Bank Kit*
- Hemp Dry Material Packages
- Fan Replacement**
*Recommended for off-grid installations without electricity.
**We recommend considering the purchase of a replacement fan along with your toilet, so you’ll have one on hand in case the original fan eventually needs replacing after year(s) of use.
GL 90
The GL 90 is a composting toilet that does not require water or electricity to function. Unlike traditional flush toilets, the GL 90 doesn't require flushing. All waste simply falls into and composts within a sub-floor GL 90 composting unit.
This split-system toilet features a stylish porcelain pedestal in the bathroom. It connects to a composting container located below floor level. When full, you simply swap the container with a spare one. This design is perfect for houses with limited space beneath the toilet.
All maintenance is done outdoors, keeping your indoor spaces clean. Using batch composting, servicing the GL 90 is straightforward and clean. When a container fills up, you seal it and leave it to compost. Then, replace it with a fresh one. Once the other container is also full, the compost from the first container is ready humus-like compost that can be reused in gardens or safely disposed of.
The system's capacity can easily be expanded with additional spare containers.
The GL 90 is a certified product Manufactured to: AS/NZS 1546.2:2008 - On-site domestic wastewater treatment units – Waterless composting toilets.
Use of the GL 90
The GL 90 composting toilet operates like a conventional toilet but without the need for flushing. All waste and toilet paper falls directly into the composting container below.
Inside the container, darkness conceals the waste, ensuring no visibility. Additionally, the built-in ventilation system in the composting container eliminates any odors, maintaining a fresh environment above.
After each use, it’s advisable to sprinkle a cupful of covering material, like hemp, over the waste through the toilet seat. You can also opt to add a larger quantity of covering material less often, such as weekly. To enhance the composting process, occasionally stir and level the compost to facilitate a more efficient breakdown.
Please remember not to dispose of plastic items, like sanitary towels, in the composting container. These should be thrown into a separate bin as they are non-compostable.
Installation of the GL 90
There are two main ways to install and service the GL 90 composting toilet. In general the GL 90 composting container has to be installed directly below the toilet pedestal. Depending on clearance height below the floor-level, the toilet can be installed and serviced either in such a way that the container is pulled out all together with the lid and the waste shaft (Option 1), or by leaving the waste shaft and the lid in place (Option 2). The option number 2 is generally more common.
For more information, please refer to the Installation and user manual GL 90
Installation option 1
Installation option 2
Service of the GL 90
When the GL 90 composting container is finally full of solid waste, the full container is pulled out below the bathroom. The full container is then sealed with a closed lid and left outside to undergo further composting process.
The empty(ied) spare container is then put into use, replacing the full container. The use of the toilet can continue right away.
The service can be done in matter of minutes without the need for tools.
Leveling the compost inside with the GL Compost Maximizer
Generally with all composting toilets, solid waste tends to pile up forming a cone shape. To use the full volume of the composting toilet, the pile should be manually rolled over. For this purpose, we offer an optional accessory called Compost Maximizer for the GL 90 . The compost maximizer is essentially a metal leveler that is manually operated by pushing and pulling it outside the GL 90 container.
The compost maximizer is an optional feature. The pile may also be leveled using virtually any stick, shovel or fork, though this may require you to pull the GL 90 container out first. Therefore, the compost maximizer is a handy feature for leveling the compost inside the GL 90 composting container.
Frequently Asked Questions of GL 90 composting toilet
Can I throw toilet paper into the composting container of the GL 90?
Yes, you can safely dispose of toilet paper in the GL 90.
How often do I need to empty the composting container of the GL 90, and how quickly does it fill up?
The frequency at which the composting container fills up varies based on the number of users and other factors such as climate. Generally, the GL 90 supports 2 to 3 people full-time or 4 to 5 people part-time comfortably.
If the usage is higher, it may be advisable to consider obtaining an additional spare container or opting for a system with larger capacity.
How much space is required below the floor for installation of the GL 90?
The GL 90 requires a minimum clearance of 13 inches below the toilet to accommodate the composting container. The GL 90 is one of the most low-profile split-system composting toilets in the market.
Can the pipe to the batch container be extended to a lower level?
Yes, the pipe can easily be extended to allow a drop of up to 10 feet. Even longer drops are possible, depending on the specific situation. We offer waste pipe extensions by the foot in our online store. You’re also welcome to contact us for more details about extending the waste pipe. Click here to see a photo of how the pipe can be extended using our green waste pipe extension.
How much space do the toilet and containers require?
You can find the exact dimensions of the porcelain toilet [click here]. The GL 90 composting bin measures 24″ x 24″ x 18″, which means you’ll need a minimum of 18″ of underfloor space beneath the building. Additionally, the access to underneath must be at least 24″ wide.
If you do not have the space below, please consider our self-contained waterless toilets.
📱(702) 328 0689
✉ info@waterlesstoiletshop.com
Specifications
| Feature | Specification |
|---|---|
| Product | GL 90 |
| Recommended For | Off-Grid Cabins, Tiny Homes, Guest Houses etc. |
| Capacity | 1-3 People Full-Time Use; 2-5 People Part-Time Use |
| Average Daily Visits | 10 |
| Container Length | – |
| Container Width | 24″ |
| Container Height | 18″ + Up To 22″ Chute Extension |
| Container Depth | 24″ |
| Minimum Under Floor Space Requirement | 18″ |
| Volume Per Container | 24 Gallons |
| Container Weight (Empty) | 13 |
| Porcelain Pedestal Weight | 60 lbs |
| Total System Shipping Weight | 118 lbs |
Delivery Contents
- White porcelain pedestal, non-separating, incl. soft-close seat and fixtures
- GL 90 composting container with a waste chute (21.6″)
- GL 90 Spare composting container with a closed lid
- Electrical duct fan
- Ventilation pipe fittings*
- Excess liquids drainage hose & fittings*
- Liquid enzyme cleaner
- Hemp dry material bale
- Instructions for installation and use
*To finish installation, you will need to source ventilation pipes from your local hardware store. Alternatively, you may purchase a ventilation pipe package separately from us.
Optional accessories
- Ventilation Pipe Package
- Extra Spare Container
- Whirlybird*
- Solar Power Bank Kit*
- Hemp Dry Material Packages
- Fan Replacement**
*Recommended for off-grid installations without electricity.
**We recommend considering the purchase of a replacement fan along with your toilet, so you’ll have one on hand in case the original fan eventually needs replacing after year(s) of use.
Aesthetically Pleasing
The GL 90 composting toilet features a porcelain pedestal that looks just like any modern flush toilet. This makes it suitable for any bathroom decor from modern tiny house to more traditional mountain cabin.
Split System Design
The GL 90 falls into the category of split-system composting toilets which means that the toilet inside is separate from the composting unit located under the floor level. This design brings a number of advantages:
- Aesthetically pleasing, familiar looking porcelain pedestal inside the bathroom. Everyone can use without any special how-to-use instructions. Also, nobody can break the system simply by using it.
- Service of the toilet is always done outside, keeping the indoors space always clean.
- Relatively large capacity. GL 90 composting toilet will go months in use without the need for service (in family-use).
Extendable Capacity
The GL 90 is not only a split-system composting toilet, it is also a batch composting toilet.
This means that you can always extend the capacity of the system according to the number of toilet users. The standard package comes with two GL 90 composting containers fit for 1-4 persons’ seasonal family use. If there are more people using the toilet or the toilet is used year-around it may be worth to buy a third GL 90 composting container.
Efficient Moisture and Odor Control
The GL 90 features containers designed with a double base and a capillary tray. This setup separates excess liquid from solid waste, maintaining optimal moisture for composting (= not too wet nor too dry) and ensuring an odorless experience.
Option: Upgrade to Urine-Separating Porcelain Pedestal
By default, all our split-system composting toilets, including the GL 90, come with a high-quality non-separating porcelain pedestal. For those who prefer, we offer the option to upgrade to a urine-diverting porcelain pedestal. This design separates urine from solids at the the toilet seat, reducing odors and need for additional bulking agents.
No Electricity? No Problem!
If electricity is not available, we recommend our Solar Power Bank Kit and Whirlybird as accessories for your off-grid composting toilet system. The GL 90 composting toilet is equipped with a 12 V DC ventilation fan (AC adapter included), which can be powered by the Solar Power Bank Kit for up to 24 hours without sunlight. In addition, the wind-driven Whirlybird ventilator provides effective ventilation on cloudy/windy days.
Customer Reviews
GL 90
| 5 star | 100% | |
| 4 star | 0% | |
| 3 star | 0% | |
| 2 star | 0% | |
| 1 star | 0% |
Customer Images
Let our customers speak for us
I have been servicing and installing composting toilets for 17 years at a seasonal cottage community. Recently I installed two of the UD pedestals for a client, I was very impressed with the quality, as was my clients. The toilets are superior to any brand I've encountered, sunmar, envirolet, nature head, all use thin plastic components. These sturdy porcelain like youd fine in a real bathroom and clean better and dont stain like the plastic ones.
Love the ability to move where the waste pipe and exhaust pipe are installed on the unit, it allows for many options when installing so you can optimize the functionality of the unit. Other units you have to compromise constantly because of the hard mounted penetrations.
Verified ownerWe are very pleased with the experience of the GL90. Everything was of good quality and mostly easy to install. The porcelain throne is very high quality and looks very nice. There is absolutely no odor. We had to turn off the power to the fan a couple of times, and there was only a faint smell of fresh pine shavings and hemp. We also inadvertently discovered that the hemp shavings are far superior to pine in the absorption factor. We see now that is explained on the website. We are temporarily using a 5 gallon plastic bottle for liquid containment until our leachate system is complete. At first we were using the supplied hemp and had little to no liquid in the bottle. When we ran out of hemp, we used some local pine shavings and noticed the bottle filled up much more quickly. I'm thinking that using hemp will allow the moisture to remain in the pile longer and allow the fan to evaporate more liquids. Hence, making for less emptying of the liquids container until leachate system and filter is installed. It did take a few return trips to town to get the 4 in vent plumbing that I could make work with supplied fittings. I would suggest giving specific instructions and materials for the type of pipe and fittings that will actually work to save people the time and effort. Fernco fittings saved the day. It was more of a challenge than I anticipated with the various 4 in pipe available on the market. AI wasn't totally accurate either because of the metric to imperial conversion. I'll post pics in the near future for reference of what worked for me. The other small details of installing the porcelain toilet: the measurements for placing the toilet mounts seemed to be a bit off and I had to screw in at an angle to get it to work. I measured several times. Also, one of the screws that secure the mounts to the floor broke as well as i was driving it in. I found a more stout screw for that. With those small details the system still rates a 5 in our experience. Service and product are exactly what we had hoped for. Thank you Nicholas.
Our GL90 is up and running; we just swapped out the container for the first time. I really love how small the composting container is, and bought an extra container in case it requires removal more often than projected.
Our situation had a number of odd wrinkles:
❖ This is an elevated house; the living area including the bathroom is 8' off the ground. The area below the house is unenclosed, so we didn't have typical space constraints.
❖ We were replacing an original "Carousel" compost toilet from the early 1980s, so we had to line the GL90 up with the original chute, and find a way to connect it to the original vent pipe.
❖ One complication is that the old Carousel was destroyed by flooding from Hurricane Milton. It was raised less than a foot above ground, and the roaring floodwaters came up about 3 feet. So wanted the replacement composting container to be elevated as high as possible. My solution was to hang it from the ceiling below the house, to avoid any structure under the container that could get washed away if we get another flood like that (even if the container itself was above the flood level).
❖ Another complication, this one self-inflicted, was that I was also reinstalling the fire sprinkler system and the water heater, both of which were also destroyed by flooding, and needed to be elevated as well -- and for various reasons needed to be in almost the exact location where the toilet needed to go, and needed to be protected from wind-driven rain.
I did have a few technical problems with the GL90:
❖ I was aware that the hose and vent fittings on the GL90 were metric, but I hadn't realized that the nominal metric sizes used in Australia are different than nominal metric sizes for hose and pipe made everywhere else in the world! After numerous false starts and then deep research, I finally figured out ways to make everything work -- but that wrinkle alone took this project way beyond the DIY world. Good thing I love a challenge, and have technical and research skills...
❖ We had a serious fly problem shortly after we began using the GL90. I still am not sure exactly why, but I did notice that the lid doesn't fit tightly on the container. The three clamps just aren't enough to keep even marginally fly-proof. My solution has been decidedly low tech: a brick on the lid between each pair of lid clamps. It's also possible that the exhaust fan is too weak; I've purchased a replacement that should move twice as much air.
❖ I still haven't figured out how to keep the toilet seat on straight. It keeps moving off center, and I'm afraid to tighten the connecting screws any further; they don't seem that robust. The brackets hold the toilet to the floor don't seem that robust either, but the toilet has stayed in place, so I don't want to argue with success (and I'm managing to avoid permanently fastening the toilet to the beautiful terra-cotta tile floor in the bathroom).
We are very pleased with the experience of the GL90. Everything was of good quality and mostly easy to install. The porcelain throne is very high quality and looks very nice. There is absolutely no odor. We had to turn off the power to the fan a couple of times, and there was only a faint smell of fresh pine shavings and hemp. We also inadvertently discovered that the hemp shavings are far superior to pine in the absorption factor. We see now that is explained on the website. We are temporarily using a 5 gallon plastic bottle for liquid containment until our leachate system is complete. At first we were using the supplied hemp and had little to no liquid in the bottle. When we ran out of hemp, we used some local pine shavings and noticed the bottle filled up much more quickly. I’m thinking that using hemp will allow the moisture to remain in the pile longer and allow the fan to evaporate more liquids. Hence, making for less emptying of the liquids container until leachate system and filter is installed. It did take a few return trips to town to get the 4 in vent plumbing that I could make work with supplied fittings. I would suggest giving specific instructions and materials for the type of pipe and fittings that will actually work to save people the time and effort. Fernco fittings saved the day. It was more of a challenge than I anticipated with the various 4 in pipe available on the market. AI wasn’t totally accurate either because of the metric to imperial conversion. I’ll post pics in the near future for reference of what worked for me. The other small details of installing the porcelain toilet: the measurements for placing the toilet mounts seemed to be a bit off and I had to screw in at an angle to get it to work. I measured several times. Also, one of the screws that secure the mounts to the floor broke as well as i was driving it in. I found a more stout screw for that. With those small details the system still rates a 5 in our experience. Service and product are exactly what we had hoped for. Thank you Nicholas.
Our GL90 is up and running; we just swapped out the container for the first time. I really love how small the composting container is, and bought an extra container in case it requires removal more often than projected.
Our situation had a number of odd wrinkles:
❖ This is an elevated house; the living area including the bathroom is 8′ off the ground. The area below the house is unenclosed, so we didn’t have typical space constraints.
❖ We were replacing an original “Carousel” compost toilet from the early 1980s, so we had to line the GL90 up with the original chute, and find a way to connect it to the original vent pipe.
❖ One complication is that the old Carousel was destroyed by flooding from Hurricane Milton. It was raised less than a foot above ground, and the roaring floodwaters came up about 3 feet. So wanted the replacement composting container to be elevated as high as possible. My solution was to hang it from the ceiling below the house, to avoid any structure under the container that could get washed away if we get another flood like that (even if the container itself was above the flood level).
❖ Another complication, this one self-inflicted, was that I was also reinstalling the fire sprinkler system and the water heater, both of which were also destroyed by flooding, and needed to be elevated as well — and for various reasons needed to be in almost the exact location where the toilet needed to go, and needed to be protected from wind-driven rain.
I did have a few technical problems with the GL90:
❖ I was aware that the hose and vent fittings on the GL90 were metric, but I hadn’t realized that the nominal metric sizes used in Australia are different than nominal metric sizes for hose and pipe made everywhere else in the world! After numerous false starts and then deep research, I finally figured out ways to make everything work — but that wrinkle alone took this project way beyond the DIY world. Good thing I love a challenge, and have technical and research skills…
❖ We had a serious fly problem shortly after we began using the GL90. I still am not sure exactly why, but I did notice that the lid doesn’t fit tightly on the container. The three clamps just aren’t enough to keep even marginally fly-proof. My solution has been decidedly low tech: a brick on the lid between each pair of lid clamps. It’s also possible that the exhaust fan is too weak; I’ve purchased a replacement that should move twice as much air.
❖ I still haven’t figured out how to keep the toilet seat on straight. It keeps moving off center, and I’m afraid to tighten the connecting screws any further; they don’t seem that robust. The brackets hold the toilet to the floor don’t seem that robust either, but the toilet has stayed in place, so I don’t want to argue with success (and I’m managing to avoid permanently fastening the toilet to the beautiful terra-cotta tile floor in the bathroom).
Could not be more pleased with this composting toilet. Will definitely use again in a future project.
I have not purchased yet but I plan to come next summer. I just wanted to give some recognition to your customer service employee Nicholas who answered my call he was very kind patient and helpful to me he was able to help me decide on the gl 90 system for my off grid ranch. Thank you for your help it means a lot
Enjoying the GL 90 We bought a property with a small cabin on it with a composting toilet. It was terrible! Lots of trouble, stinky etc. So I went on the hunt for a new one and found the GL90. I had my handyman install it. Actually we added a separate room on to the cabin. It turned out really cute. And the GL90 fits right in. Looks sleek and NO TROUBLE and no stink!!