With the hose pipe ban/water shortage, I'm going to do my bit on saving water by closing my waste tap on my 4040 so the pure to waste ratio is nearer 50:50. But what is the minium that the ro needs flushing? it usually gets left to run on a Sunday afternoon for an hour, which I'm sure is excessive.
I'm sure my water saving won't really contribute much in the grand scheme of things, but at least I will be doing something, hopefully other will also.