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Re: tap water pH
>Of course, both calculations, yours and mine, make a lot of
>irrelevant assumptions so neither are really applicable to water
>changes in an aquarium.
>>Once its mixed, the buffers take over and the pH will likely shift
>>some, with the final number depending on the buffer capacity in the
>Just be careful, that initial pH spike might be a little higher than
An aquarium at pH 7.0, KH 5 and 15 ppm CO2 subject to a 15% water
change with pH 10 and 0 ppm CO2 would result in a CO2 concentration of
0.85 x 15 + 0.15 x 0 = 12.75 ppm CO2, right?
Now, the KH has also dropped a tiny bit, but according to the
pH-KH-CO2 chart on the Krib, the pH would only rise by about 0.1,
which is hardly enough to worry about.