A composting toilet only works well if the liquids stay out of the solids — and that's the job of a urine separator. We've been making them for over 20 years, hand-forming each one in our Snowdonia workshop. When we started, nothing on the market did the job properly, so we designed our own — and two decades of refinement later, it's still made here, by us.
We make two designs, the Compact and the Complete, both in black or white and both dispatched within 24 hours. Whether you're building a toilet from scratch or upgrading an existing one, the separator is the single most important part you'll fit.
Compact or Complete?
Compact
£31.50 · black or whiteFills the front third of the seat opening and can be nudged forwards or back to sit just right. Supplied square, so you can trim it to fit. Best for tighter or custom builds.
Complete
£42.50 · black or whiteFills the whole seat opening — a funnel at the front and an enclosed area at the back that contains the solids. Supplied pre-cut, ready to fit. Best for compact builds like houseboats and motorhomes.
Both are made from 4mm ABS plastic with a 30mm outlet and a removable metal filter.
Separator guides
How We Made Our Separator
The 20-year story behind our urine separator design.
Read moreDIY Instructions
How to fit your separator into a composting toilet.
Read moreInternational Postage
Buying from outside the UK? How to order from your country.
Read moreGuide to Soak Aways
Setting up a soakaway for the diverted urine.
Read more19 products
Composting Toilet Guides
How They Work
Urine separation, the soak, and the wheelie-bin system explained.
Read moreFAQ
Common questions about composting toilets, answered.
Read moreInstallations
Composting toilets we’ve installed at sites across the UK.
Read moreOur History
Designing and building composting toilets since 2005.
Read moreGuide to Soak Aways
How to set up a soakaway for the diverted urine.
Read moreTestimonials
What our composting toilet customers have to say.
Read moreDIY Instructions
Building your own? Step-by-step installation guidance.
Read moreBlog posts
Liquid Gold: What to Do With the Urine Your Composting Toilet Separates
The liquid your composting toilet diverts isn't waste — it's free fertiliser. Soakaways, diluted plant feed, compost activators and tree bogs, plus how to pick the right urine separator.
Ordering a Urine Separator from Ireland: What to Expect
Ordering a urine separator or compost toilet to Ireland? Here's what to expect on shipping, VAT, planning and DIY — plain, honest, no surprise fees.
How our urine separators are really made — and what the reviews got wrong
A popular review describes our urine separators as a "simple deep-drawn part" with a "wavy surface". Here's what our separators are actually made from, how the design has evolved over 20 years, and...
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