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So on 7/20, my OCL was 1ppm, so I figured I was really close. Then this morning (7/21 - 0600hrs.) my OCL was 5ppm!!!!! 41ppm at 9:45pm. I did do something I don't normally do. I added my chlorine at 8:30pm, but then I brushed the pool. Normally I brush the pool around 5 or 6pm. Could...

So I should make sure I pass a OCLT at regular slam levels and then maintain Mustard Slam levels for 24 hours after passing a OCLT?

Hello, been using the TFP method since April of this year after I fired the pool guy. These forums have been a wealth of information and everything has been going by the book until recently. In the end of June I noticed small yellow patches in the attached spa and a few in the shady areas of...