That's quite remarkable. I reckon on losing around 5 litres a day, so quite a contrast. I know I lose some from splashing over the edge of the stream bed, and where the liner doesn't quite reach fully into the sump. I think, also, your mesh cover is a lot more efficient than my perforated upturned lid - which over time becomes clogged and so needs to be cleaned out periodically. The loss has increased over the years, so maybe there is a small leak somewhere in my system.philipy wrote: ↑Sat May 25, 2019 10:00 am ...... it's losing say 15 litres a month!
I'm 99% sure I haven't got a leak, I put it down to a combination of evaporation, the plants using some, and the birds drinking and splashing. The local blackbirds, sparrows and goldfinches have dicovered that they can sit on the bank and drink, and if they jump in they can splash bathe for ages and the water goes everywhere!
Rik