After about 25 bottles of bleach, adding enough at night to get chlorine levels to around 20ppm each morning pool cleared in 3-4 days. I was testing twice a day and always added chlorine after sunset. Each night I tested before adding more, and chorine would usually drop back to mid to low teens. Clear as a bell now and trying now to keep it at "best guess" targets for my cyanuric level. Is it time to tackle light brown stain on steps? I have been reading about ascorbic acid and "jacks pink stuff". Thinking I need to stabilize chlorine first....any thoughts. Thanks for the help.