Have yellow stains on steps and around vinyl liner. pool 18x36 20000 gal. inground. I put vitamin c tablet on step cleared stain off step. What do I need to do now? This is my test results: TDS 400, Total chlorine 8, Free Chlorine 8, PH <6.2, Total alkalinity 10, Adjust alk. 0,Total Hardness 120.
Help what to do? I'm newbiee just found site so simple terms thanks.