If your CYA is 20, then you need to keep your FC at 12ppm. With a vinyl liner, you are safe to go up to, but not beyond 15ppm, which will speed up the algae killing.
Carl
If your CYA is 20, then you need to keep your FC at 12ppm. With a vinyl liner, you are safe to go up to, but not beyond 15ppm, which will speed up the algae killing.
Carl
Carl
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