Trelino FAQ - Frequently asked questions

General questions

The inner workings of a composting toilet essentially consist of three parts: separator, urine canister and solids container. The separator leads the urine into the canister, while the solids end up in a bucket with a compost bag. To learn more, you can read our page "How Does a Composting Toilet Work?".

Yes, it is ready to go! For any Trelino® toilet you order, you should receive the following:

  • The body
  • The toilet seat with a separation insert & an attached lid (for the Evo series) or a wooden lid (for the Origin)
  • A urine canister
  • A lid with a membrane closure
  • One additional closed lid,
  • A solid waste container
  • 10 plastic bags that fit your toilet

Trelino® is a quality product designed to last. A high-quality composting toilet that will accompany you for many years and makes a statement against the throwaway culture. In addition, Trelino® combines optimal functionality, ease of use and high comfort behind a unique design.

No! The whole point of using litter as a cover material to dry out the poo is that you can use the bag for several days and only empty it once full enough. Depending on the size, the bags hold between 3 and 12 number 2s.

The Trelino® Origin series is our original product that we designed and manufacture with durability and compactness in mind. It has a unique composition with a outer toilet plus toilet seat & urine separator made of high quality polyethylene plastic (PE). It is combined with a shapely wooden lid made of birch multiplex giving it a nice, modern image.

Some features:
- Robust and durable body
- Wooden lid is strong and supports high loads
- Removable seat with urine separator
- Low weight, easy to transport (11 - 15 lbs. depending on model)

Our Evo series is our brand-new product series that we launched in the fall of 2022. It was designed to be even more lightweight, convenient and comfortable than our previous product lines. Therefore it is probably the lightest composting toilet on the market and ultra portable.
Both the body, made of ABS, material of the highest standard, and the containers, made of out of high quality PE, are made of recyclable plastic and are resistant to aqueous chemicals.

Some features:
- Ergonomic seat (like at home feeling)
- Ultra lightweight (9 - 11 lbs. depending on model)
- Soft-close automatic lid
- Clean design

While our toilet is made to accommodate anyone of any age, there are some factors to be aware of in order to get the best use out of your Trelino®. Younger children can use the toilet, but we strongly recommend that they are supervised while doing so as this is not a toy.

For us, sustainability and environmental awareness do not end with disposal - we think beyond the garbage can. That's why we use renewable, organic materials for our solid bags that can be easily composted.

The correct sitting position is crucial for the best possible function of a composting toilet. For anatomical reasons, this differs for women and men.


For other types of toilets, you might use a fan to counteract condensation, which accelerates the drying process of the solids and ensures that fragrances quickly dissolve into thin air.

This is not necessary for your Trelino® because you would use a litter material after each use which dries out the solids and removes the smell. On top of that, the emptying cycles are quite frequent so you can very quickly dispose of your bag.

For more information, read our blog post here.

Diarrhea is not a problem when using a composting toilet. Just use more litter to compensate for the liquid.

Urine can easily be disposed of in a toilet connected to the sewer system. Diluted, it is also suitable as fertilizer for the home garden or the raised bed on the balcony. The bag with the solids can be disposed of similarly to a diaper or dog poo bag. We recommend checking local regulations for disposal guidelines. Conditionally, composting is also possible. The urine canister and solids container can be emptied independently of each other.

There are a variety of different sprinkles. We primarily recommend our scent blocker, as this is optimized for composting toilets. The moisture is well extracted and released. In addition, it improves odors that arise due to its composition.
Alternatively, you can also use small animal litter or bark mulch. There are still numerous alternatives that our customers use. For more detail on these options, you can read our page "Consider Your Litter".

We have created these composting toilets in order to promote sustainability and to take a stand against chemicals. The separator is what gets this job done. By separating liquids from solids, dried material is now ideal for compost as long as the correct accessories are used. These include compostable bags as liners and organic litters which also prevent smell.

Yes! Even after just going number 1, you can drop the toilet paper into the solids bucket. After wet toilet paper is dropped in, it should be covered with a little bit of litter in order to keep the smell away. Types of toilet paper which are best for composting are organic, print free options. Additionally, hygiene products such as tampons, pads, and diapers should not be thrown into the solids container. 


Cleaning a composting toilet is as simple as its use. The household remedy diluted citric acid or vinegar has proven its worth.

The urine canister should be rinsed out with vinegar or citric acid (can also be used diluted) after every, every second emptying. To do this, allow the acetic or citric acid to act for a while and shake. This will loosen any deposits.

Installation & applications

Yes! The Trelino® Evo models can be kept in wet conditions as they are made of plastic and won’t be prone to mold or warp. The Trelino® Origin options have wooden lids but can also be used in the wet bath. However, the lids should have a finishing oil applied beforehand to make them more water resistant. For each model, we do recommend that the toilets are given time to dry so that there is no mildew buildup around them.

Your Trelino® can be used almost anywhere! You can carry it with you to do your business in the great outdoors or keep it installed in a camper van or even in a cabin. With the variety of sizes available, you can decide which space is the perfect fit for you and your toilet.


You can clean your composting toilet with diluted concentrated vinegar. This remove all urine residues and odors from your composting toilet.
Afterwards, make sure that the composting toilet dries out well before you use it again.

The solids tank of your composting toilet will smell if the waste cannot dry well. Therefore, drying must be optimized. Try using either more litter or different litter. With this you can already achieve significant differences. However, to significantly improve the air circulation, the use of a fan would be recommended. This transports the moist warm air outside, so that everything can dry well.

If you notice an odor coming from the urine canister, it is probably urine scale. The use of table vinegar, which you can leave to soak in for a longer period of time, will remove the deposits. Sometimes a stubborn deposit requires several applications. In the future, prevent urine scale by filling the urine canister with a little vinegar or lemon solution after every, or at the latest after every second, emptying of the urine. Let the solution soak in and shake vigorously once so that all deposits can dissolve.

While a Trelino® can be used in any weather, there are some tips we recommend for differing temperatures. In very hot weather, toilets should be emptied more often as they can become more prone to smells. In very cold temperatures, our toilets should be given more opportunities to air out. The difference in temperatures between the contents of the toilet and the colder weather can cause condensation and slow down the composting process. To help air out your toilet, you can install a vent attachment or take it outside to breathe with the lid off periodically.

Care tips

Please make sure that you ventilate your wood separation toilet regularly to prevent moisture from accumulating in it. Wood as a natural material can react to persistent humidity. If urine or water does get into it, make sure it dries out before using it again. Effective microorganisms can also be used to treat urine spills.

We recommend leaving the separation toilet open when not in use for a longer period of time, so that moist air cannot accumulate in it. Persistent moisture, even in the form of humidity, can lead to mold over time.

Shipping & Returns

USA: Yes, Domestic ground shipping is free for all orders above $250 (for Alaska and Hawaii, we charge a fee of $30 to cover the excess shipping fees).

Canada: Shipping to Canada is done via international express air freight and comes at additional costs. These costs are subsidized by us, so they are lower than what you would normally pay.

Everything you want to know about returns can be found here in the revocation policy

The entire returns process can take up to 10 days. As a rule, however, the refund will be issued immediately after receipt of your return.