Wow! Thanks for all the advice on31ll, and judging by the time of your post you too search this forum at stupid-o'clock!?.
As for my installing and intentions of set up I am going a little 'off track!'. Firstly I'm installing this for my brother who is using the unit to make his own filtered water for his marine fish tank. He has no room to house the unit under his sink, where I suggested having it and also does not have a separate utility room. Therefore we are left with the idea of placing the unit in the garage. As a result, I was intending to run the feed from the outside garden tap? I have seen an adapter that I could screw onto the existing tap which does a similar job to a washing machine 'Y' connector but will allow him to also connect his garden hose to so can still water his garden etc. I would then connect the 'tap connector' to this and run direct from the outside tap configuration to the garage in the smaller 1/4 inch pipe to feed the unit. (Roughly 2metres and under the decking). I am aware that this run of pipe would need to be insulated to prevent freezing, perhaps using lagging? Any ideas? Once linked up to the system the next hurdle is the waste. Again intending to run the waste through the garage and into their water butt? Or into the drain for the garage guttering? I was wondering if this would be best to install a check valve on the waste outlet, especially if running to their water butt?
As for the pure water, again they were hoping I could run to another, covered water butt stored inside the garage so they could store it until they need to do their water change in the fish tank.
I am aware the garage is a risky place to store the RO unit due to freezing but will intend to insulate as best as possible and maybe house in a cupboard or something? Again any ideas?. I was also going to install a service valve on the feed once inside the garage in order to help when doing maintenance to the unit.
Think that's about everything!? If you could see any potential problems with this idea I would be grateful if you could point me in the right direction.
many thanks once again for all your help and support.
pete.