I am getting through loads of water, Tried having varistream on 3 and 4, Now tried it on full (9) as peter fpgwell and jeff teperary (something like that!!

) Was saying on a previous post, But seem to use the same amount of water anyway. I have a 400 litre tank in my van and from what i have read on here people are doing 15-20 house with this (maybe more).
I struggle to do 7 or 8

any tips or advice, Maybe a useful video? I have a tap on my belt so not much gets wasted between windows etc. Thinking of getting a bigger tank.