Composting
Off-Grid
Indoors
Floor-standing
Tiny House
ADU
Urine-diverting
Year-around
Luxurious
Cabins
RVs
Large capacity
Cold climate
Glamping
Outhouses
Batch toilets
Public use
Single-chamber
Toilet Pedestals
Accessories
GL 90
Swappable bin system
$1,489.00
A real porcelain toilet in your bathroom, with the composting bin out of sight under the floor. The GL 90 needs 18″ of clear space below the floor – a crawl space is usually enough. No water, no plumbing, no septic. Two bins come in the box: when one is full, you swap it from underneath, typically months apart rather than every week or two.
Ships from Henderson, NV · Pay over time with Klarna or Afterpay
18" Below clearance required
Shipping from Nevada
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60-second overview
Full walkthrough (5:42)
GL 90
Made for cabins and tiny homes with a crawl space. The GL 90 looks and works like an ordinary toilet – the only difference is that nothing is flushed. Waste drops through a short chute into a 24-gallon bin below the floor. Most of the liquid is used up in composting and evaporates through the vent; a double base drains off the rest. A small 12V fan (included) keeps a steady draw down through the toilet and out of the roof, so the bathroom stays odor-free.
Emptying is a swap, not a shovel job. When a bin is full, slide it out, close the lid and set it aside to finish composting, then slide the empty one in. Everything happens under the floor, never in the bathroom.
Who it suits: comfortably 1–2 people full time or 1–4 part time with the two bins in the box – two adults full time typically swap a bin about every three months. Each extra bin adds room for one more full-time user, so capacity grows with you.
Off-grid? Run the fan from our Solar Power Kit, or vent with a wind-driven Whirlybird – no electricity needed.
Made in Australia by Green Loo. Certified to AS/NZS 1546.2:2008 – Waterless composting toilets.
Use of the GL 90
Use it like any toilet – the only difference is that you don’t flush. Waste and toilet paper drop straight into the bin below, where it’s dark, so there’s nothing to see from the seat. The fan keeps a steady draw down through the toilet, so the bathroom stays odor-free.
After a #2, sprinkle about a coffee mug of dry material – like the hemp included – through the seat. After peeing, nothing. More doesn’t help; it just fills the bin faster. Choose something slightly coarse – very fine sawdust packs down. If a guest forgets, no harm done.
Don’t put in wipes, pads, diapers or other plastics – keep a small trash can for those.
Installation of the GL 90
Most customers install the GL 90 themselves or with a handyman – you usually don’t need a plumber or an electrician.
Below the floor you need at least 18″ of clear space, and room to slide the 24″-wide bin in and out. The chute must drop straight down.
Two ways to install it:
Option 1 – for tight spaces: a short 8″ pipe (included) goes through the floor and connects the toilet to the chute below. The chute sits on top of the bin and slides in under that pipe on timber guide rails – so when you swap, the whole bin slides out with its lid and chute.
Option 2 – the most common: the chute is fixed through a 9.8″ opening in the floor, and the bin slides out from under it, leaving the chute and lid in place.
Also plan for a 4″ vent pipe up through the roof, as straight as possible (our Ventilation Pipe Package, or any hardware store), and a downhill run for the liquid hose – to a canister or a small absorption trench.
Step-by-step instructions: Installation and user manual GL 90 (PDF)
Installation option 1
Installation option 2
Service of the GL 90
When a bin is full, you swap it from under the floor – it takes a few minutes and no tools.
- Disconnect the liquid hose (lift it first so any free liquid drains off) and the flexible vent pipe.
- Slide the full bin out. With Option 1, the lid and chute come out with it: undo the two latches, twist the lid off and move it onto the empty bin. With Option 2, the chute and lid stay in place.
- Close the full bin with the solid lid from the spare bin and set it aside to finish composting – on average 2–3 months, longer in cold weather.
- Slide the empty bin in and reconnect the hose and vent.
A completely full bin can weigh around 110 lbs, so many owners swap a little before it’s full. Finished compost is dry, earthy and much lighter – use it on plants you don’t eat, or dispose of it as local rules allow.
Leveling the compost inside with the GL Compost Maximizer
Solids tend to pile up into a cone under the chute. To use the bin’s full volume, level the pile now and then – with a stick, shovel or fork after sliding the bin out, or without pulling it out using the optional Compost Maximizer, a metal leveler you push and pull from outside the bin.
Frequently Asked Questions of GL 90 composting toilet
How much space is required below the floor for installation of the GL 90?
The GL 90 requires a minimum clearance of 18 inches below the floor to accommodate the composting container. The GL 90 is one of the most low-profile premium waterless 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 floor-standing waterless toilets.
How often will I swap a bin?
As a rough guide, two adults living there full time typically swap a GL 90 bin about every three months; with weekend or holiday use it’s usually much less often. A lot depends on how many people use it and how often, your climate and how much dry material you add, so think of it as a starting point. With the two bins in the box, the GL 90 comfortably suits 1–2 people full time or 1–4 part time, and each extra bin adds room for one more full-time user. Tell us who will use it and we’re happy to estimate it for your situation.
Does it smell?
Usually not at all. The fan keeps a gentle draw down through the toilet and out of the roof, and the double base helps keep the compost from getting too wet. Quite a few of our reviewers came to the GL 90 from a composting toilet that did smell.
Where does the liquid go?
Much of it is used up in composting or evaporates through the vent. The rest drains out through a hose – often to a small canister you empty now and then, or to a shallow absorption trench outside. What suits you best depends on your site, your climate and local rules, and we’re happy to help you choose.
Do I need electricity?
Not necessarily. The included 12V fan uses only about 3 W, so a small solar kit can run it, and with no power at all a wind-driven Whirlybird can do the venting.
Can I use it in winter?
Yes. The toilet keeps working; composting simply slows down or pauses in freezing weather and picks up again when it warms. If the liquid hose can freeze, it’s worth insulating it.
Is the urine-diverting toilet a good fit for me?
Both options work well – it mostly comes down to how you’ll use the toilet. With the standard toilet, the GL 90 bin takes care of the liquid itself: much of it is absorbed and evaporates, so there’s usually only a little left to handle, and guests can use it like any toilet. That’s why many of our customers go with it, especially for cabins and rentals.
A urine-diverting toilet separates urine right at the seat into its own container. The trade-off is that there’s more liquid to empty – a 5-gallon container can fill in under a week for two people – unless your local rules allow it to go to a greywater system or the ground. It also takes a little getting used to.
Not sure? Tell us how you’ll use it and we’re happy to help you choose. More in our article Urine Separation in Composting Toilets.
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.
Do I need a permit? Is it NSF certified?
Permits are local – usually handled by your county’s environmental health office. None of our toilets are NSF 41 certified, as it’s a very long and costly process. The GL 90 is certified to the Australian/New Zealand standard AS/NZS 1546.2, which many offices accept with documentation, and we’re glad to help with the paperwork. More in Composting Toilet Rules in the U.S.
Can I pay over time?
Yes – you can choose Klarna or Afterpay at checkout.
Where do I get spare parts?
Right here in our shop: Replacement fan, Liquid Enzyme Cleaner, Hemp Bale and GL 90 Extra Spare Container. Please order them from us rather than from the Australian Green Loo site.
Still have a question about this product? Browse our FAQ centre — or contact us and we will answer it.
📱(702) 328 0689
✉ info@waterlesstoiletshop.com
Specifications
| Feature | Specification |
|---|---|
| Product | GL 90 |
| Recommended For | Off-Grid Cabins, Tiny Homes, Guest Houses etc. |
| Capacity | 1-2 People Full-Time Use; 1-4 People Part-Time Use (each extra container adds one full-time user) |
| 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) | approx. 13 lbs |
| 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
Made for cabins and tiny homes with a crawl space. The GL 90 looks and works like an ordinary toilet – the only difference is that nothing is flushed. Waste drops through a short chute into a 24-gallon bin below the floor. Most of the liquid is used up in composting and evaporates through the vent; a double base drains off the rest. A small 12V fan (included) keeps a steady draw down through the toilet and out of the roof, so the bathroom stays odor-free.
Emptying is a swap, not a shovel job. When a bin is full, slide it out, close the lid and set it aside to finish composting, then slide the empty one in. Everything happens under the floor, never in the bathroom.
Who it suits: comfortably 1–2 people full time or 1–4 part time with the two bins in the box – two adults full time typically swap a bin about every three months. Each extra bin adds room for one more full-time user, so capacity grows with you.
Off-grid? Run the fan from our Solar Power Kit, or vent with a wind-driven Whirlybird – no electricity needed.
Made in Australia by Green Loo. Certified to AS/NZS 1546.2:2008 – Waterless composting toilets.
Use of the GL 90
Use it like any toilet – the only difference is that you don’t flush. Waste and toilet paper drop straight into the bin below, where it’s dark, so there’s nothing to see from the seat. The fan keeps a steady draw down through the toilet, so the bathroom stays odor-free.
After a #2, sprinkle about a coffee mug of dry material – like the hemp included – through the seat. After peeing, nothing. More doesn’t help; it just fills the bin faster. Choose something slightly coarse – very fine sawdust packs down. If a guest forgets, no harm done.
Don’t put in wipes, pads, diapers or other plastics – keep a small trash can for those.
Installation of the GL 90
Most customers install the GL 90 themselves or with a handyman – you usually don’t need a plumber or an electrician.
Below the floor you need at least 18″ of clear space, and room to slide the 24″-wide bin in and out. The chute must drop straight down.
Two ways to install it:
Option 1 – for tight spaces: a short 8″ pipe (included) goes through the floor and connects the toilet to the chute below. The chute sits on top of the bin and slides in under that pipe on timber guide rails – so when you swap, the whole bin slides out with its lid and chute.
Option 2 – the most common: the chute is fixed through a 9.8″ opening in the floor, and the bin slides out from under it, leaving the chute and lid in place.
Also plan for a 4″ vent pipe up through the roof, as straight as possible (our Ventilation Pipe Package, or any hardware store), and a downhill run for the liquid hose – to a canister or a small absorption trench.
Step-by-step instructions: Installation and user manual GL 90 (PDF)
Installation option 1
Installation option 2
Service of the GL 90
When a bin is full, you swap it from under the floor – it takes a few minutes and no tools.
- Disconnect the liquid hose (lift it first so any free liquid drains off) and the flexible vent pipe.
- Slide the full bin out. With Option 1, the lid and chute come out with it: undo the two latches, twist the lid off and move it onto the empty bin. With Option 2, the chute and lid stay in place.
- Close the full bin with the solid lid from the spare bin and set it aside to finish composting – on average 2–3 months, longer in cold weather.
- Slide the empty bin in and reconnect the hose and vent.
A completely full bin can weigh around 110 lbs, so many owners swap a little before it’s full. Finished compost is dry, earthy and much lighter – use it on plants you don’t eat, or dispose of it as local rules allow.
Leveling the compost inside with the GL Compost Maximizer
Solids tend to pile up into a cone under the chute. To use the bin’s full volume, level the pile now and then – with a stick, shovel or fork after sliding the bin out, or without pulling it out using the optional Compost Maximizer, a metal leveler you push and pull from outside the bin.
Frequently Asked Questions of GL 90 composting toilet
How much space is required below the floor for installation of the GL 90?
The GL 90 requires a minimum clearance of 18 inches below the floor to accommodate the composting container. The GL 90 is one of the most low-profile premium waterless 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 floor-standing waterless toilets.
How often will I swap a bin?
As a rough guide, two adults living there full time typically swap a GL 90 bin about every three months; with weekend or holiday use it’s usually much less often. A lot depends on how many people use it and how often, your climate and how much dry material you add, so think of it as a starting point. With the two bins in the box, the GL 90 comfortably suits 1–2 people full time or 1–4 part time, and each extra bin adds room for one more full-time user. Tell us who will use it and we’re happy to estimate it for your situation.
Does it smell?
Usually not at all. The fan keeps a gentle draw down through the toilet and out of the roof, and the double base helps keep the compost from getting too wet. Quite a few of our reviewers came to the GL 90 from a composting toilet that did smell.
Where does the liquid go?
Much of it is used up in composting or evaporates through the vent. The rest drains out through a hose – often to a small canister you empty now and then, or to a shallow absorption trench outside. What suits you best depends on your site, your climate and local rules, and we’re happy to help you choose.
Do I need electricity?
Not necessarily. The included 12V fan uses only about 3 W, so a small solar kit can run it, and with no power at all a wind-driven Whirlybird can do the venting.
Can I use it in winter?
Yes. The toilet keeps working; composting simply slows down or pauses in freezing weather and picks up again when it warms. If the liquid hose can freeze, it’s worth insulating it.
Is the urine-diverting toilet a good fit for me?
Both options work well – it mostly comes down to how you’ll use the toilet. With the standard toilet, the GL 90 bin takes care of the liquid itself: much of it is absorbed and evaporates, so there’s usually only a little left to handle, and guests can use it like any toilet. That’s why many of our customers go with it, especially for cabins and rentals.
A urine-diverting toilet separates urine right at the seat into its own container. The trade-off is that there’s more liquid to empty – a 5-gallon container can fill in under a week for two people – unless your local rules allow it to go to a greywater system or the ground. It also takes a little getting used to.
Not sure? Tell us how you’ll use it and we’re happy to help you choose. More in our article Urine Separation in Composting Toilets.
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.
Do I need a permit? Is it NSF certified?
Permits are local – usually handled by your county’s environmental health office. None of our toilets are NSF 41 certified, as it’s a very long and costly process. The GL 90 is certified to the Australian/New Zealand standard AS/NZS 1546.2, which many offices accept with documentation, and we’re glad to help with the paperwork. More in Composting Toilet Rules in the U.S.
Can I pay over time?
Yes – you can choose Klarna or Afterpay at checkout.
Where do I get spare parts?
Right here in our shop: Replacement fan, Liquid Enzyme Cleaner, Hemp Bale and GL 90 Extra Spare Container. Please order them from us rather than from the Australian Green Loo site.
Still have a question about this product? Browse our FAQ centre — or contact us and we will answer it.
📱(702) 328 0689
✉ info@waterlesstoiletshop.com
Specifications
| Feature | Specification |
|---|---|
| Product | GL 90 |
| Recommended For | Off-Grid Cabins, Tiny Homes, Guest Houses etc. |
| Capacity | 1-2 People Full-Time Use; 1-4 People Part-Time Use (each extra container adds one full-time user) |
| 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) | approx. 13 lbs |
| 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.
Premium Design
The GL 90 falls into the category of premium waterless 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 premium waterless toilet system, it is also a swappable bin system.
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 premium waterless 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 dry cover materials.
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.
Off-grid cabin · Kentucky
No Plumbing, No Problem
Scott of Bluegrass State of Mind installed the GL 90 in his off-grid Kentucky cabin — no plumbing, tight space, and everything hidden below the floor. He documented the full 72-minute installation on YouTube.
“We love it — mainly because it’s so compact inside your cabin. That’s literally all you have to deal with.”
Customer Reviews
GL 90
Customer photos and videos
Let our customers speak for us
Verified ownerThis solved a problem that we were having trouble with. Worked perfect!
Verified ownerI wasn't sure what I was getting into with this toilet system but since it was the only option I had for my off grid cabin, I rolled the dice and I'm glad I did. Installation took me longer than it should have with trying to figure out the best method, but after that it was easy. I installed it in July and have visited the cabin every month since then. There have never been any foul odors and other than losing a toilet brush inside, it's been great. I highly recommend.
Verified ownerFirst experience with a waterless toilet. Everything works as expected.
I can't provide pictures. The installation is in a high elevation, snowy location, that has already been winterized for the season.
I wasn’t sure what I was getting into with this toilet system but since it was the only option I had for my off grid cabin, I rolled the dice and I’m glad I did. Installation took me longer than it should have with trying to figure out the best method, but after that it was easy. I installed it in July and have visited the cabin every month since then. There have never been any foul odors and other than losing a toilet brush inside, it’s been great. I highly recommend.
First experience with a waterless toilet. Everything works as expected.
I can’t provide pictures. The installation is in a high elevation, snowy location, that has already been winterized for the season.
We have been using our GL 90 for about the last 5 months now. We had another composting toilet previous to the GL 90. Our previous composting toilet was not working properly. It was not composting making the yearly maintenance on the toilet a nightmare. It was basically an indoor out house. The only upside to the old system was that it did control odor but that was about the only plus. So far the GL 90 has been much better. We did get the urine diverting toilet and I believe that makes a huge difference. We have to empty the urine container every 5 days or so but if all that was going into the composting container I cannot see how any composting could occur with that amount of moisture. We are happy that we went with the urine diverting option. As for the waste container it seems like we need to swap it out about once a month with full time use. I was thinking that we might get a little more time before we had to swap out the container but after our last system this is much better. We also upgraded the fan and that made a huge difference with odor control. Installation was pretty straight forward because we had a system with ventilation previously. Overall we are very happy with the GL 90.
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.