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Just received my TF100 test kit and I seem to have a problem. CH test is at 1000ppm and all other tests are within normal range. Before using the Tf100, one pool store test showed CH at 1100 this was about a month ago. Drained pool about 2ft and refilled had store check again and CH had dropped...

FC 7ppm CC 0 TA 40 CH 1000 CYA 40 PH 7.2 Salt Level 2550 Have been chasing the CH for a couple of months, fill water is around 100ppm. Had it down to 600 and now it is back up! Pool is two years old and water is crystal clear. Will add salt tonight did'nt realize it had gotten low. This is my...