So yesterday I met a fellow windy at the suppliers buying his first off the shelf WFP system. As Adam stacked up the bits the look of 'what have I bought' kicked in. So I said bring it on over and I'll help out so we put it together today which brings me to my question....... His RO has a built in pressure gauge and when I connected it to my tap the pressure gauge said 30 PSI. Now I don't really understand the water pressure and it fills my 500L in about 5-6 hours through my 20" RO which is OK with me but would I benefit from a booster pump and if so why? What Ideally should water pressure be to get optimum production? Thanks for the helpful answers in advance.