Average Cya additions

CYA normally decays at a rate of 2-3 ppm per month, sometimes up to 5 ppm with high FC or high temps. If FC drops below minimum for your CYA, [FC/CYA][/FC/CYA], sometimes bacteria can consume it. Of course, rain, splash out or overflow will lower your cya. I had to add some CYA in the spring and again a week or so ago.
 
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