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I just tested a friends pool and don't know what I should work on 1st. He uses HTH Dual action pucks (Trichloro-s-Triazinetrione with copper) for chlorine. I have the Taylor K2006 test kit. FC 0 CC 0 PH 5 or so (I had to test with my aquarium kit to verify this low) TA 0 (best I can tell...

I have seen posts about how using tri-chlor pucks adds CYA to the water. What I am unclear of is how much CYA I can expect each puck add to the water. If the 3" pucks are 45% available chlorine, what would the approximate PPM per puck increase be per 10K gallons? My CYA reagents are so old they...