27' round AGP, 17,100 gal pool. It has been perfect all year except CYA around 100-110 because I use trichlor pucks in the feed. In prepping to install my new SWG, I drained around 20% of water and refilled to get the CYA down around 80 -90. The yesterday, added 440lbs Morton Solar Salt. Checked CL before bed, it was around 3ppm, added around 60oz 10% liquid CL to bump it up. (I stopped using the trichlor to keep CYA down while I wait to put in the SWG) This morning, to my suprise, CL was 0.
Can adding salt do this? It has been real warm and humid, a lot of people in the pool the last few days, but I have been vigilant about keeping FC around 5ppm.