Monthly. If you aren't using stabilized chlorine or getting several inches of rain a week then it will not change quickly enough to warrant testing more often than once a month.
Ok so tested it when I opened the pool in May it was at 70 so my target chlorine level was 7-9. Just tested it now and it's at 50...which is nice that lowers the target chlorine level.....I just hope that there is no problem
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