i use an ro on a 1:2 ratio.
for me to make 1000lts of pure it costs me just under £10. including waste cost.
i only use about 400lts a day so for a week looking around £30 for water.
but for the money you get back from it, its just pennies really!
oh ok that's not really that bad then
not sure on my waste ratio thou
what RO you got?
easy way to find out is to see how long it takes to fill 100ml of pure water, then if that takes 2 minutes, then on the waste time the water for 2 minutes and see what water you have in the jug.
if there is 200ml then its 1:2
if its 300ml its 1:3 etc etc
so for me every 1000lts i make 2000lts go down the drain,
you can get a discount from waterboard for the waste