The Planted Tank Forum - View Single Post - Can you make sense of my parameters?
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post #10 of (permalink) Old 11-28-2012, 08:13 PM
Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Posts: 11,624
My tap water alters through the year, and depending on what the water company is doing. I have tested GH and KH at varying levels from 3 degrees to 5 degrees. Most of the time it is 4 to 5 degrees. The one time it tested at 3 degrees was a bit of a surprise.

The water company alters the pH with sodium hydroxide, and it usually tests in the upper 7s. A friend on a related water supply tested the pH at 9.0 one time. I have seen mine in the upper 8s, but not often. The pH in my tanks will drop when I use a high CEC substrate. I wonder if the substrate is removing the sodium hydroxide? I KNOW it is removing the carbonates.
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