I have a Hot Springs hot tub that I've had for about 8 months. It has the freshwater salt system, which has been GREAT so far. It maintains CL without me doing anything. Unfortunately I ignored it for a while and the FC level went through the roof. It was 30+ last week. Turned the salt system to off and thought it would come down fairly quickly. It's been a week and the FC is still at 15ppm. Either it is still making chlorine while off, or it just takes a long time for that much FC to dissipate. Anyone else experience that?