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 dissolvable chlorine. It raise the total chlorine but not the free. When I do add the chlorine the spa becomes cloudy and then a white filmy stuff appears on top of the most of teh water and then taken away by the filter.
Any ideas and help would be apprecitated. Thanks