spruce, I'm going to be moving into my new house in the next couple of weeks. I'm moving from a soft water area to a hard water area. The PPM in the new area is just over 200. I'm thinking of getting one of these and house it in my garage http://www.purefreedom.co.uk/water-...ro-system-c-w-auto-shut-off-1000ltr-tank.html. I've done a water pressure test today and this is the reading I know nowt about RO, but would I need a HF4 or HF5 filter?