Worry-free on board

The portable toilet without water, pump, chemicals or power.

No more clogged toilets. No more disposal stress.

With Trelino®, what used to be a chore barely crosses your mind.

✅ Worry free on the water: No jammed pumps, no winterizing, no spare parts. Spend your time sailing, not fixing.

✅ More freedom on the water: No tank, no pump-out, no deadline. Go further, stay longer, come back whenever you're ready

Why more and more boat owners are switching to Trelino®

Trelino® follows a simple, natural principle: separation instead of chemicals. Compared to traditional cassette and seawater toilets, you save water, avoid unpleasant smells, clogged pumps and long queues at disposal stations – and gain more freedom and independence.

Trelino® Seawater toilet Chemical toilet
Where & how often can you empty it? ✅ Any toilet, every 1–3 days ❌ Only a pump-out station, once full ❌ Only a special disposal point, every 2–4 days
What do you carry ashore? ✅ A small, light canister and a bag ✅ Nothing — pumped out via hose at the dock ❌ A heavy, full cassette
Chemicals needed? ✅ None ✅ Not required — only optional tank deodorizers ❌ Yes
Power needed? ✅ No ❌ Yes, the flush pump runs on 12V ✅ No
Can it clog? ✅ No — no flush, no pipes to block ❌ Yes, toilet paper or debris can jam the pump ✅ No, just a sealed holding tank
Does it smell after a while? ✅ No — separation keeps everything dry ❌ Yes, aging hoses start to smell ❌ Yes, masked, not solved
Anything to winterize? ✅ Nothing ❌ Pump and hoses ✅ Just the seals

No more chemicals

Trelino® composting toilets rely on a simple function: the separation of solids and liquids by a built-in divider. Solids are then covered with litter to minimise odours without the need for chemicals. 

Odour-free & hygienic

Thanks to the separation of liquids and solids and the drying of the latter, the toilet remains odourless. It's hygienic, clean – and a welcome companion for every journey.

Completely waterless

Trelino® works without any water to give you the most independence on the water. No flushing, no connections, no wasting precious resources. Just set it up and go. 

Easy to empty & clean

The liquid and solid containers can be emptied separately and effortlessly. Smooth surfaces without corners or edges make cleaning quick and easy using eco-friendly household cleaners.

Trelino® fits perfectly in …

Motorboat
Motorboats
Sailboat
Sailboats
Canal boat
Canal boats
Fishing boat
Fishing boats
Trelino® separation toilet

… and many more!

What our customers really love

Trelino Step-by-Step Guide

An integrated separator in the seat funnels liquids into the urine canister, while solids fall into a separate container. Solids are covered with litter to absorb moisture and lock in odours. The simple principle: separate, dry, done.

Image 1
Line the solids container of your Trelino® with a waste bag.
Image 2
Add two cups of litter to the bag to support the drying process.
Image 3
Take a seat and do your business in peace.
Image 4
To prevent odors, liquids and solids are separated using the separator insert.
Image 5
Cover your solid waste with two cups of litter for drying.
Image 6
Easily remove and empty the containers separately.

Our Toilet Series

Trelino® Evo

The Evo series combines comfort, design, and function in a super-light, easy-to-clean casing made from recyclable plastic. It also features a soft-close lid and an ergonomic seat.

All Evo Models

Trelino® Origin

Robust, compact, and built to last: The Origin series is made from high-quality PE plastic and comes with a birch wood lid – practical and natural in appearance.

All Origin Models

Trelino® Timber

Our most homely option: With an oiled wooden body, the Timber series is a stylish eye-catcher – ideal for fixed installations and wooden interior.

All Timber Models
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Frequently Asked Questions

A dry separation toilet consists of a body, a lid and a toilet seat. Its inner parts include two containers and a urine separator. This separates liquid from solid and thus forms the heart of the toilet. The aim is to keep the big business as dry as possible.

For this purpose, the urine is diverted to the front into a canister. To prevent leakage and odors, the lid of the canister has a special membrane. The solid waste ends up in a separate container lined with a garbage bag. Here you can also throw the toilet paper.

To enhance the drying process, sprinkle the big business with bedding material after going to the toilet. Drying prevents the formation of bacteria, which are responsible for the usual odor. For emptying, you can remove both containers separately from each other.

Odors occur when solid and liquid waste mix. By separating the waste and then drying the solids, unpleasant smells can be minimized.

Suitable types of litter include: sawdust, small animal bedding, Terra Preta, coconut coir bricks, litter with activated charcoal, soil, and coffee grounds.

You empty the two parts separately, and you don't need any
special disposal point:

Urine: pour it into any normal toilet, for example in the marina's sanitary
building, at a campsite, at a restaurant or at home.

Solids: they go into the bag in the bin. Tie it up and put it in your normal
household waste.

So you're never tied to a pump-out station. That's especially handy
in places where there aren't any.

Cleaning a composting toilet is simple and can be done effectively using mild household agents such as diluted citric acid or vinegar. pH-neutral cleaners or those with effective microorganisms are also suitable. Harsh chemicals and abrasive tools should be avoided, as they can damage the material.