What would cause my Chlorine reading to go up overnight doing the OCLT. At 11:00 I took a reading off 22.5 . Now at 5:45am the reading is at 25. Yes, abuse the FAS-DPD kit. New sand put in our filter before starting SLAM.
OCLT
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Either the water circulation was not consistent or adequate for one of those tests, a testing error of some kind, or the SWG was still on.
Testing method error. There is a mistake somewhere in your technique. FC cannot EVER go up unless you added some FC. Was your SWG off?
We will be swimming today. Passed all three criteria . Dead algae must have been in the old sand.
