In mid October, we added salt to our new pool-- initially up to 3500 ppm. It has a Pentair IC40. After superchlorination for the first 24 hrs, we set it to 80%, and later dropped it to 60% since temperatures were starting to drop in late October. I always got a really bright, almost yellow-orange color on my 5 drop chlorine test, and decided to drop it to 20% to see if I could get it down to the 2-4 ppm range. There was no color change, so I dropped it to 10% and it was still bright yellow--probably higher than 5 ppm. So out of curiosity, I took a water sample to a trusted pool store.
He said that my water chemistry was perfect(thanks to TFP!), PH 7.6, TA 80, CYA 60, although my chlorine was sky high. So I decided to set it to 0% until it drops to the 2-4 ppm range. That was 3 weeks ago and it's still bright yellow--probably more than 5 ppm. We hardly used the pool in November because of the cooler temps, but have used the spa only a couple of times since. Currently, the salt level on the indoor controller's at 3000 ppm. I wonder how long it will take to get the chlorine into the proper range? Could my chlorine generator still be generating chlorine even though it's set at 0%?