This has me puzzled, and it has happened a few times. A few days ago I tested chlorine. I had been letting it stay at about 7.5 ppm for several days. After a full day of consistent rain, I tested the water expecting to see a lower result, but the test gave me a result of 9.5 ppm. Since that made no sense to me, I used water from the same sample for a second test with a result of 5.5 ppm.
Today I tested and first got a result of 10 ppm, tried it again with a result of 8.5 ppm, and a third time with a result of 7.5 ppm, all with water from the same sample. My other test today resulted in CC 0 and pH 7.6. Any ideas what's going on?
If it makes a difference, my full set of test results from 12 days ago was