In August I changed over from a 400 gpd RO to a 4040 with Booster pump.
I set waste ratio to what I though "looked about right" but never actually measured and timed the waste/pure output.
I guestimated it was about 70% waste to 30% pure.
Fast forward to today.........
The quarterly Water Bill comes through the letterbox for just shy of £400!!!
Our water supply is metered and is usually around £180-£200 every quarter.
That was an expensive mistake..............