Thanks for the replies. I guess I'll add some CYA with the goal of 15 ppm, and see how long that takes to show, maybe a week or so, and then eek it up to 30-40 ppm SLOWLY.
Last year at this time my CYA was >> 100 ppm after I bought this house & pool combo. I found this site by chance, and started following the recommendations including a 50% water drain / fill. The former owner used Tri-Chlor pucks. In fact I still have a bucket of those dudes. Maybe this is a good time to use these up to provide chlorination + stabilizer, and then cut back and replace with bleach once my CYA comes up where I want it. What-da-ya-think?
Jim
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