I have a 1100 gallon custom tile inground spa. We have not been using much lately with the weather and have been keeping it covered most of time. Keeping the temp ~85 most of the time. I have noticed that my free chlorine levels have been off the charts. We have a salt system and I have turned the generator way down. WE have a service who comes every other week and I take care of it in between. The free chlorine level today was in the 40 ppm range. I was thinking of using thiosulfate to bring this down. Is this the best way to do this--or should I keep it uncovered and see if it will come down on it's own. This level is also interfering with other measurements but i think my TA is quite low as well--at least by strip measurement. I usually use the Taylor 2006 DPD test kit for more exact measurements. My pH level is high as well--at 8.4. This seems common with the salt system and I am constantly adding acid. I can't do an acid demand test right now as the high chlorine level interferes with it. I have also noticed the water is foaming a fair amount now as well.
Any help/advice is appreciated. Thanks!
Pat
Any help/advice is appreciated. Thanks!
Pat