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Oh I do :) Have been using a Taylor K2005 test kit. With its reagents expiring, I've got a K2006 on order. (That upgrade gets me a color-change titration for the chlorines rather than a color match - much more accurate. Am considering an electronic pH meter to get away from that color match...

They are In The Swim 3" Chlorine Tablets. The technical Specifications from their web site are: In The Swim 3” chlorine tabs compare to Bio-guard, Sun, Guardex and Pace. One 3” Tablet of Trichlor delivers approximately 5.495 ppm of available chlorine and 3.27 ppm of Cyanuric acid into 10,000...

Thanks for your thoughts. For both pre and post August 2019 I used Trichlor. The only change was the brand. Will look at ABC's of Pool Water Chemistry.

My pool's CYA measurements are around 90 ppm. If I have to I'll drain 70% or so and refill. Several products are advertised as "cyanuric acid reducers" and seem appealing. I've tried one with no success. Are any of these known to actually work? Thanks in advance,

Here's my problem… I have tried to maintain a balanced pool with target values of FCL 3 ppm, pH 7.5, TA 90-100 ppm, Ca Hardness 200 ppm, and CYA under 50 ppm. Been failing to meet the CYA target and am running more like 90 ppm. Prior to around August 2019 my pool's pH would routinely creep...

And am looking forward to becoming better educated about the care of my backyard pool. Am a retired medical physicist who is comfortable with making measurements, doing calculations, and hopefully reaching correct conclusions. I found this forum because I've been chasing a problem. I'll post...