if you are in a hard water area ask if you can get another di vessal fitted as you will save money on resin.
I flush my RO every 2 fills for 10 mins (and I use pure water to do it

), pre filters once a month, maybe I dont need to, but at the cost they are I prefer to save the membrain.
they is a nice cafe in grisby where andrew drops you off, also a libary where you get 30 mins free internet connection, the bus company do a day ticket which I got and stayed on most of the day to amuse myself also there is an arcade (won quite a bit in there) and bingo with the old ladies was fun anything to pass the time and it feels like your a kid waiting for christmas.
Im on second bag of resin so would say about a bag every other month with 1 di 2 di's 1 bag every 3x.
Ian