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Yes, you must drain the pool to lower the cyanuric acid. You are guaranteed to have too much cyanuric acid if you keep using tri-chlor tablets. As someone else pointed out, the cyanuric acid test is not all that accurate either. Get the test done a couple of times when you refill your pool and...

One of the managers at the pool store said the problem with the CYA neutralizer is the formation of crystals that destroy the cartridge filters, and that can't be removed when cleaning the cartridges. I suppose that you could put some sort of pre-filter into the pump basket or skimmer to catch...