Re: Do 3" tablets go bad?
Please post a full set of test results for Free Chlorine, Total Chlorine, pH, Total Alkalinity, Calcium Hardness and CYA (stabilizer).
Also please post the surface of your pool (plaster, vinyl, fiberglass) and the volume in gallons (or the dimensions, average depth and shape)
Then we can get a handle on what is happening in your pool. If you have the test results from when you closed the pool, particularly the CYA level post that also....it might help!
Retired pool store and commercial pool maintenance guy.
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