Pool store testing is wildly variable because often the tester/associate does not do the test properly. Your test is the one to trust! You are good to go! I would definitely stop the trichlor pucks, though. You should do your own CYA test and see how close you come the the pool store CYA number. CYA testing is very subjective, so if you do your own, exactly the same way each time, you will have a better idea of the level and any increases. Any way, if you are getting in the 40-50 range with CYA, that's plenty for most folks. You don't want to go higher unless there's a reason (extreme heat and direct sun for most of the day, most of the pool season).

Make sure all your levels (TA, pH, CYA, TC, CC) stay in range (BBB method only!) and you'll be fine. Stay away from pool store chemicals.


Good luck.