GL Systems

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The GL Composting Systems are innovative, split-system batch composting toilets designed and manufactured in Australia. The GL systems are distributed in the United States by Waterless Toilet Shop.

The GL systems feature a sleek porcelain dry toilet pedestal, indistinguishable from conventional toilets, installed inside the bathroom. The term “split-system” means that there is an external composting unit directly underneath the bathroom floor level connected to the toilet by a waste pipe. All waste, including toilet paper, simply falls into the external GL composting container under the floor. Therefore, the GL composting toilet systems, like all split-systems, require a certain amount of space under the bathroom floor level.

As a batch composting system, the GL design uses two (or more) composting containers that rotate in use. When one container fills up, it is replaced with an empty one, allowing the full container to complete the composting process outside. By the time the second container is also full, the compost in the first container is ready for use as safe fertilizer for non-edible plants and trees. This efficient and sustainable design ensures continuous use while contributing to environmentally friendly waste management.

gl 90 inside bathroom

Like a regular flush toilet but without the flush

The GL Composting Systems very closely resemble regular flush toilets, with a distinction that they are not flushed. Inside the bathroom, you’ll find a bright white, porcelain dry toilet pedestal that looks and feels just like a conventional toilet. The sleek and modern design ensures that it blends seamlessly into any bathroom décor.

Instead of flushing, waste simply drops directly into the composting unit located beneath the bathroom floor. The use of the toilet is just as straightforward and familiar as any traditional model, meaning no special instructions are needed, making the GL systems ideal not for private family use, but also for settings like a rented cabin (e.g. Airbnb), where various guests might use the toilet. Additionally, the system is robust and durable, ensuring that it can withstand regular use without risk of damage, further enhancing its appeal as one of the most user-friendly and reliable composting toilets on the market today.

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Batch composting principle gl 90
The GL Systems are batch composting toilets which means that there are two (or more) composting containers that switch position between being in use and outside composting further.

No smell at all – Totally odorless!

The GL Composting Systems are completely odorless, making them a standout choice for those concerned about unpleasant smells often associated with composting toilets. The key to this odor-free experience lies in the system’s design. The GL composting units feature a double base that effectively separates excess liquids from the solid waste mass, maintaining the compost at an ideal moisture level—not too wet and not too dry—perfect for the natural composting process. This careful balance is crucial in keeping the composting mass almost entirely odorless.

Additionally, the GL systems are equipped with a ventilation system that ensures air flows continuously from the composting unit through a ventilation pipe out into the air. For indoor installations with access to electricity, an electric fan is used to further enhance ventilation, ensuring that any slight odors are swiftly carried outside. This combination of features ensures that the GL systems remain completely odorless, providing a comfortable and hygienic bathroom experience.

Low-profile Composting Unit

The GL Systems are an excellent choice for many households because they require only 18 inches of clear space below the bathroom floor level to install the external composting unit. This low-profile design makes the GL systems versatile and accessible, fitting into spaces where other split-systems might not.

If you don’t have any space beneath your bathroom floor, we recommend exploring our self-contained composting toilets instead.

However, if there’s even a slight possibility of creating that 18 inches of space, it’s definitely worth the effort. Split-systems like the GL are renowned for being as close to regular toilets as composting toilets can be, offering a familiar bathroom experience.

Additionally, if you have more than 18 inches of space available, you might want to have a look at the other split systems we have as well that require more clearance but offer larger capacity and even longer service intervals.

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GL 90 Model

The GL 90 model is the larger option in the GL Composting Systems lineup. The basic package includes two containers, each having a capacity of 24 gallons. This model is ideal for one or two people using the system full-time, year-round, or for a family using it seasonally, such as in a holiday home or cabin. When considering the system’s capacity, it’s important to note that only solid waste—poop, toilet paper, and some dry material—contributes to filling the container. Excess liquids are efficiently drained from the composting unit, so the container’s capacity is based on solid waste accumulation only.

Please note that providing an exact number of uses before the system needs servicing is challenging due to various factors like individual habits, climate, and more. However, the GL 90 is generally well-suited for the scenarios mentioned above. The composting containers are 24 inches wide and 18 inches high, with a waste shaft that can be extended up to 22 inches above the container. This adjustability ensures that the system can fit beneath various bathroom floor levels.

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