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I think the component I've been missing is frequency. From what I'm hearing I should keep pounding it in increments of 8-12 hrs not to exceed 24 hours until the readings hold. I have been shocking then waiting a couple of days then shocking it again. I'm going to do the slam making sure I...

Another test today (from another source) showed ph at 7.7 A little closer to the target

Trying to open and balance the pool this year has become a nightmare. After repeated shocking ,the free chlorine level still dissipates overnight . latest readings are TC 2.1 FC 0 PH 8.4 Alkality 130 Calcium hardness 225 CYA 80 . (done by a well respected pool store). The water is...