Hi ,every-one, This is my first post on this site, so please excuse any bad form etc. My problem is this: I was always wondering why I couldn't grow decent plants in my tank-only plenty of algae. I recently started seriously investigating why this was happening and came to the conclusion it is due to my tap-water. When I tested it I was amazed to see the phosphate reading was off the scale. To try and get round this, I started using rain water mixed with tap water, this helped but means I have to rely on getting enough rain (not reliable in what is officially the driest place in the country). The only other alternative was an R.O. unit which i bought a few weeks ago. However, it now seems my tap pressure is not great enough to produce a decent amount of R.O. water but plenty of waste, in fact it takes about one day to produce 5 litres of usable water-not nearly enough as I have a 215 l. tank. Does anyone have any solution to this, perhaps some sort of pump to increase the pressure? Any help/suggestions gratefuly received.