Is it at all possible that one of your swimmers made a "warm spot" in the still water?
Re: Testing chlorine when the pump is not running
Is it at all possible that one of your swimmers made a "warm spot" in the still water?
12'x24' oval 7.7K gal AG vinyl pool; ; Hayward S270T sand filter; Hayward EcoStar SP3400VSP pump; hrs; K-2006; PF:16
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