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Urinal for your composting toilet: Trelino, BOXIO, Kildwick, Separett

Wall-mounted waterless urinal for owners of separation toilets – Trelino, BOXIO, Kildwick, Separett, CompoCloset. Hangs on the wall next to the toilet, urine is collected separately in a canister. Less liquid enters the toilet: the container fills more slowly, and the contents remain drier.

Why the liquid waste container overflows

In a separation toilet, the main volume is urine. Compact models have a small liquid waste container, and with two users, it fills up in a couple of days – it needs to be emptied too often. The construction itself works correctly, the problem is one: the container cannot keep up with the volume of liquid.

Pi-Pi solves exactly this: a man urinates standing, against the wall, and all his volume bypasses the toilet into a separate canister. Less liquid enters the toilet: the container fills more slowly, and the contents remain drier.

Technical facts

  • Weight 1.4–1.5 kg: mounts on any wall next to the toilet, including thin partitions
  • Material LLDPE: operating range −40…+60 °C, suitable for unheated bathrooms, cabins, and vans
  • Installation 5–7 minutes: no plumber, no special tools required
  • Stepped nozzle Ø24/32/40 mm: connects to the outlets of Trelino, BOXIO, Kildwick, Separett, CompoCloset without adapters
  • Standard: closed top, for installation without ventilation
  • Standard Plus: top opening Ø70 mm for connection to existing ventilation of the separation toilet

What to do with collected urine

  • Fertilizer: some gardeners use diluted urine as a feed; take the rules and dilution ratios from official or professional recommendations of your region and site rules
  • For disposal: flat canister empties in a couple of minutes

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Pi-Pi complements your composting toilet – it doesn’t replace it

You already run a Trelino, BOXIO, Kildwick, Separett or CompoCloset, and with two users the liquid container keeps overflowing. Pi-Pi doesn’t compete with your toilet: it’s a separate wall urinal, men use it standing, and all the urine bypasses the composting chamber – straight into a jerrycan or the existing vent. Less liquid enters the toilet: the container fills more slowly, and the contents remain drier.

  • Trelino Origin / Evo: the Standard bottom outlet feeds the liquid jerrycan, the Ø70 mm top inlet on Standard Plus ties into the Trelino vent
  • BOXIO Toilet: with two users the BOXIO jerrycan overflows in a couple of days – Pi-Pi adds a second circuit and clears the problem
  • Kildwick, Separett, CompoCloset: drain into the liquid container, vent through Ø70 mm without an adapter

Seamless connection: the stepped outlet Ø24/32/40 mm meets the pipe already there, and the Ø70 mm top inlet on Standard Plus meets the existing ventilation duct without an adapter.

Frequently asked questions

The waterless urinal collects urine separately, so less liquid enters the toilet: it fills up more slowly, and the solid fraction remains drier. It complements the toilet, not replaces it: the liquid goes into a separate canister through a hose, and the Ø70 mm port on Standard Plus connects to ventilation.
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Connection is possible if your toilet has a separate outlet or liquid container: the stepped outlet Ø24/32/40 mm goes into it via a hose. The top port Ø70 mm on Standard Plus connects to the ventilation channel; compatibility for Separett, Biolan, and Green Toilet is indicated on the model pages.
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With a closed container and a clean hose, the Pi-Pi waterless urinal does not smell: urine immediately goes into the container. In an enclosed space, ventilation through a Ø70 mm port helps. If an odor does appear, check the hose, container, and filter screen.
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How often to empty the canister depends on its volume and the number of users: a guideline is once every 1–2 weeks for one user. Empty it in advance, before it fills up, and rinse the canister with water.
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Have Questions?

Got a question? Message me – I’ll help you pick the right model for your garden shed or toilet setup and sort out delivery. I respond within one business day.

Mart Tamm

Mart Tamm

Account Manager for United Kingdom

Have questions about products, pricing, or partnership? Email me directly – I’ll respond personally.

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