The Planted Tank Forum - View Single Post - 4dKh solution help.
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post #2 of (permalink) Old 08-01-2017, 11:04 AM
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The first thing I'd check is the pH test solution. It may be bad. If you truly made a 5 dkh solution, you should have a result of it being blue, not dark green.

I generally only add the pH solution when I'm actually filling my drop checker. I only need 1 drop, but that's a very small amount of water.

BTW, it's generally useless to test pure distilled water. With nothing in it, the pH reading from a test kit or even a pH meter tends to be all over the place.
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