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Old 12-12-2007   #4 (permalink)
KoiCop
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Join Date: May 2005
Location: Southern California
Posts: 2,675
Hello koiscales . . .

I'm sorry, but IMHO using BS to 'stabilize' pH in the 8.3 range is an example of treating the symptoms rather than fixing the problem -- and is not something that advanced hobbyists should consider doing.

If water quality out of the tap is adequate (pH, KH & GH), pH swings should be less than .5 per day -- even in full sun. The usual cause of pH swings (outside of unbalanced KH & GH readings) would be plants/heavy algae in the pond producing of CO2 and taking up the oxygen at night.

In this case, getting rid of the plants/algae is the proper solution -- not baking soda.
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