I went to a local pool store to have my water tested. Their computerized test measures all chemicals in balance. Free chlorine 1.65. Total chlorine 1.65. Ph 7.2. Alk 109. Cyn acid 75. Pool temp 80. Live in PA. The pool store test involved measuring the water in several different vials and putting the vials in a digital reader attached to the computer. Water is crystal clear. Sand filter recently back washed. Sounds good, right?
Problem: htp brand and aqua check brand pool strips register chlorine level as zero. The pool store owner used both of these test strips at my suggestion in the water sample I brought and got the same result I got at home...chlorine reads zero on these strips. So Why do these strips, which for the past 5 years used to measure all chemicals correctly for me, they do not measure chlorine?
We even checked his computer test and compared it to a test involving testing the water with drops and comparing the water in a rectangular vial that had color test strip on the side of the vial and even this test showed the chlorine was fine.
So what do I do now?