So I ordered a magnetic stirrer last week to speed up the testing process and so far I'm loving it. The problem I am encountering is inconsistent chlorine tests. For example, last night I tested the chlorine levels and came up with 4.5ppm. I then tested it manually and the result was 6.5. I then tested again using the magnetic stirrer and get a result of 5. The night before I added enough chlorine to bring my levels up to 6. So the manual process always seems to show me closer to my goal where as the magnetic stirrer has me adding chlorine on a nightly basis. Has anyone else experienced this using a magnetic stirrer? The TA test always come out exactly the same no matter what. It's only with the chlorine test that come out wrong. I don't know which one to trust more.