I got 28 this last test. This chlorine test seems kind of random. Anybody else have issues with it? Does it matter if I put two drops and swirl or do I need to swirl on each drop? Going to be hard to test overnight drop if tests are so random. I am going to wait 2 hours and test this time. I don't think the algae is eating it very fast. Plus I don't want to run out of the DPD powder in the middle of my slam.