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As a child I recall using rain water from a downspout on some houseplants and all that I watered with this water died. I always take pause as I see the water gushing from the downspout here in Florida and I think its a perfect source of water. I was wondering if anyone else can comment or provide information on studies done on the quality of the water coming off a rolled or shingled roof?
David, here on the Big Island of Hawai'i, most of the population relies upon roof catchment systems for water supply. I recently had my tank water tested because the volcano is venting again. Other than insignificant amounts of sulfer and iron, it was virtually mineral free. I use a sediment filter before my pump, and an extremely fine filter after the pump, then an ultraviolet disinfecting system. The water coming from the tap is about as pure as bottled water, no bacteria and trace amounts of minerals. I have an anodized aluminum roof, about 2800 sf.