Hello every one. I am looking at getting in to the hole rain water Harvesting thing, But I am unsure of what I will need. The water that comes off my roof reads 00.18 ppm. Rain water collected from the sky last night reads 00.01. Tap water hear is 247. So I think I can get that 00.18 down a bit, if I give the gutters a good clean out then may be could get down to 00.15. I am unsure of what I will need to pass this through, is it a case of pumping the water through a DI vessel. Or can I pass the water through this set up I have already? Also is it much more cost affective to harvest the rain water, when you have to use resin still and the power bill for pumping the water? O and I cant dodge the water company any longer, seams that they think it would be a good idea for us to go on a meter Any help would be great thanks chaps.