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chlorine
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I have a spa ghat is about 1300 gallons. The toal chlorine is between 5 and 10 and the rest of the stats are within range. It get a lot of use. The free chlorine is very low .3 to not there . I have treated it numerous times with a cholreine free oxidizer but it doesnt seem to be helping. I was using 3in chlorien tablets but switched to teh ...