this post was submitted on 05 Mar 2026
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Our shower drains into the grey water tank and then to our fruit tree irrigation line, so... Of course yes.
I've done the maths!
Shower water /is/ normally collected in grey water systems, but piss would be so diluted as to be a negligable contaminant. A shower uses roughly 70 litres of water. An average human bladder voiding is 400ml, so that works out at 0.57% piss in the grey water collected in a single shower. Negligable - but for fruit trees, a fertiliser.