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Green Toilet Waterless Toilets: Batch Composting, Unique Technology, and Tips for Owners
Article updated 18.8.2026
Green Toilet is Pikkuvihreä’s own composting toilet range, made in Finland and built on more than 30 years of experience with dry toilets. Over the years the range has grown to cover practically any installation or use case — from an outdoor cottage toilet to indoor use in a year-round home, and even public facilities.
In this article we go through what makes Green Toilet a reliable and durable choice, and at the end our expert shares tips to help current Green Toilet owners get even more out of their toilet.
The guiding principle behind Green Toilet’s development has been simplicity and durability from day one. No fragile parts to break.
Anyone can use and maintain it themselves. The product’s structure itself supports nature’s own process.
Batch composting – a simple and hygienic principle
Green Toilet works on the principle of batch composting: the toilet’s exchange container fills up during use, and once it’s full, it’s swapped for an empty one. A sealed lid is placed on the full container, and it’s left to compost undisturbed on its own — no need to stir or otherwise handle it.
This means the user is never in direct contact with fresh waste, and swapping the container takes only a few minutes. While one container is in use, another is composting — additional exchange containers can be purchased as needed, so capacity is practically unlimited even if toilet use changes and extra capacity is needed.
A unique intermediate-floor structure
At the heart of Green Toilet’s technology is its unique double-floor structure, which works on the same principle as a self-watering plant pot. The structure lets excess liquid drain away from the compost mass, while also capillary-wicking moisture back into the compost as needed.
This keeps the compost’s moisture balance exactly right throughout the composting process, which improves the compost’s structure and speeds up decomposition. The same structure is also responsible for the lack of odor: when liquid and solids stay separate and ventilation works, the toilet stays odor-free without water, electricity, or chemicals.
Over 30 years of experience and the trust of thousands of users
Pikkuvihreä was founded back in 1993, and the company has specialized throughout its history in ecological toilets, wastewater purification, and composting. Its 30+ years of experience also show internationally: the company has taken part in World Toilet Summit events in Singapore (2001), Beijing (2004), and Philadelphia (2010), and has received Agenda21 environmental awards in 1998 and 2005.
Practical experience from thousands of orders every year and a reseller network around the world has fed directly back into Green Toilet’s technology — customer satisfaction today stands at 98%.
Green Toilets are in use on every continent in the world, and some are also in demanding public use, such as with glacier tourists in Iceland and at Helsinki-Outhouses in the city area.
A model for every installation and use case
The Green Toilet range has grown to cover all the most common needs:
- Green Toilet 100 Easy — an affordable, easy-to-install basic model for the cottage, with a 100-liter container for 4–5 people in seasonal use or 2–3 people year-round.
- Green Toilet 120 Family — a favorite for family use at the cottage. Fits under a traditional wooden toilet seat box, making it an easy way to convert an old barrel-style outhouse into a composting toilet.
- Green Toilet 330 — a large-capacity model for heavy use and bigger households or public facilities.
- Green Toilet Light — a lightweight, urine-diverting model designed especially for cottage use.
- Green Toilet Lux and Compact Lux — models designed for indoor installation, with real porcelain pedestals and a neat look; the Compact Lux also suits tighter spaces.
What all the models in the range have in common is that the toilets work without water or electricity, maintenance is tool-free, and the structures come with a 10-year warranty.
Explore the Green Toilet range
If you’re already a happy Green Toilet user, here are a few more tips for use and maintenance.
A little “laziness” pays off when it’s time to change containers
Every so often it turns out that cottage owners are a little too eager to swap an empty Green Toilet container, even though the previous one isn’t full yet. Compost works best once it’s filled past the halfway point of the container’s volume. If you hold off and simply level and loosen the compost, its volume keeps shrinking even with continued use. In short, it’s best to swap Green Toilet containers only once leveling the pile no longer helps and the volume is truly running out.
When can you use toilet compost freely?
Many questions relate to when the soil produced by Green Toilet can be used freely in the garden or on the property. How long composting takes depends a lot on conditions, but in Europe that time is usually 8–14 months.
In practice, with Green Toilet, it’s always best to let the mass in the exchange container mature undisturbed right up until you actually need to bring that container back into use. Users notice that during storage the compost mass can shrink to as little as half its size, and becomes much lighter.
When handling the compost, trust your senses: if the compost looks like soil and smells like soil — it’s soil!
What if you use Green Toilet more and it fills up?
Spending time at the cottage has been popular in recent years, and it’s fairly common to run into situations where a previous toilet solution is no longer enough for increased use.
Green Toilet is a great system in that you can get as many exchange containers as you like. That means capacity is practically unlimited, and users never get stuck, even if the number of users multiplies.
Small changes, big impact
Composting is a process that depends on natural conditions, and sometimes even a toilet that has worked very well can go through unexpected changes.
The good news is that improvement often comes from very small tweaks. Increasing the amount of bedding material, or switching to a different type, can easily bring odors under control. Various bio-accelerators also speed up composting and thereby increase capacity.
Improving ventilation also affects the amount of liquid, and through that, composting.
Tell us about your experiences with the Green Toilet!
Many of our customers have some model of the Green Toilet product family in use. For us, as the manufacturer of the product, we seldom hear anything from our customers. We believe it is, because our customers see everything working as expected and are happy with their Green Toilet. Still, we would like to hear from you! Please email and tell us
- How do you like the Green Toilet?
- What is working well?
- Is there a way to make the Green Toilet even better?
Contact us at sales@pikkuvihrea.fi
