What size pump do you have? Are you running the pump 24/7 and backwashing as needed?
I have no idea what is in Walmart Extra Blue shock. Can you list the ingredients?
Your numbers look pretty good but you didn't list a pH reading.
What test kit did you use to get these numbers? (You won't be able to test pH accurately while the chlorine is that high, by the way.)
Welcome to the Pool Forum!
Bookmarks