I cannot begin to remember everything that has gone into the pool prior to this chlorine lock. My husband feels this has been coming on for at least six months beginning with an abundance of leaves that blew into the pool from a neighbor's "stockpile" of leaves from his back 40. It seems we have had trouble ever since with staining, algea, and now this cloudiness that will not go away. Other than regularly adding chlorine 3" tabs to the auto-clorinator, some algicide, some ph down, and 2 cases of plain Bioguard shock, that's it. I cannot recall the amounts of anything except most recent mega dose of shock. Oh...the 6 gallons of bleach last night. We will get a test kit today from the dreaded Walmart so as not to wait. I will begin adding 2 gallons of bleach per night beginning tonight. Will test asap with new test kit and post results.