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I used tap water for years with no problem. My ph was 6.7 with 260 ppm. A few months ago I switched to a ro system, things seem ok, I really don't notice any changes. I got my from Apec, an outfit in Calif. American parts and American made. I decided on it after some research. The waste...

You want your water in the low 70's, 74 max. I don't use airstones, no need for it in an aero system. Use frozen water bottles to lower temp.