02-08-2008, 05:21 PM
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I don't know if this applies to your case or not, but I discovered that if I let my tap water simply aerate in a bowl overnight the ph goes from 7.0 to over 8.0. It's as though it is reacting to the air and becoming alkaline. Probably someone here with a chemistry background can explain this. I know the water is hard. I overdoes it with neutral regulator and let it sit for at least 48 hours before I use it in my tanks. This seems to get it back into the low 7.x range. I can never get it to 7.0 because the minerals are buffering the regulator too much.