Poolman,
.CYA stays at the top 3 inches of the surface of the pool on a calm steady day. Draining from a skimmer or a scum ledge is the best way to lower CYA if it gets too high
DavidD, Waterbear, and DavidS (that's me) are in sync on this one. I have never heard that before but would love it to be true. However, that would mean that if you did a CYA test and dipped 6 inches below the surface in a calm pool, you would get a zero CYA reading.
Lowering CYA would be a chip shot with a variety of methods
Dave S.
As an aside, the Moderator of the forum is ADAMANT about people in the profession identifying themselves as such. Your username implies that but it's not clear. Glad to have you on the forum
Dave S.
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