We purchased our house from my husband’s parents 5 years ago. Along with it came a 22000 gallon in ground pool. My mother in law maintained it for years using shock and chlorine tabs and never worried once about the cya levels and never had an issue. Now for the last 3 years we’ve had an iron issue with our steps staining brown. I’ve since educated myself on using bleach instead to raise FC, using a polyfil filter to get rid of iron, etc. My husband is sick of having to buy and store jugs of bleach and chlorine and now for the last week our local Walmart has been out of both and hearing there will be a shortage this summer. We have dichlor but hesitant to use it because our cya is in the upper 50s and don’t want to raise it anymore. My question is this: how are people using shock and chlorine tabs all season long, year after year and not having the issues we are having??