According to my new test kit, my pH has been holding around 7.6-7.8 & I have been steadily adding acid every few days trying to bring it down to around 7.2, but have noticed very little color change on my tester.
Yesterday, I decided to pull 2 water samples & carry them to two different pool stores to get my water tested. All numbers came up about the same as what I come up with using my big test kit...except pH. Yesterday morning I still showed a pH a little higher than 7.6, the first pool store came up with 7.8 (test strips)...the second pool store came up with 7.2 (little cannisters they inject water into then stick the cannister into a reader thing)
Why can't I come up with a definitive pH? Am I using some diluted acid? It is from last year & has been stored in my shed all winter.
Is there a better way of checking pH? Anyone else besides a pool store that can check it & maybe have a more accurate way of doing so?