I live in Burlington Ontario Canada.
We have been fighting what we believe is dead algae. I believe we still have active algae somewhere, because even if we vacuum the dead agae to waste and day or so later it is back. When we notice it most, is after we shock the pool with a typical bag of shock from Walmart. Below I have listed a little bit about our system and size as well as a test result from our local (pool shop).
Inground pool 47696 l/ 10,494 gal (imp) Vinyl liner
Salt system Zodiac clearwater
Hayward pump and sand filter
reading as of today we put a bag of shock in last night and the system ran all night. The water is clear with some tan/brown substance on the bottom.
FC 7.03 PPM
Cyanuric Acid 37
Pool is sitting around 80 F
We have done the shock then algaecide.
Other than the obvious question which is how can I get this so we are on a maintenance schedule as opposed to algae fight schedule?
?? Can I vacuum to the filter then back wash? All we seem to be doing is vacuuming, filling the pool, find the dead algae, then vacuum again to waste?
?? We have scrubbed every part we can get our hands on. I did use a sand filter cleaner earlier in the year, and sand was replaced last year. Could the live algae be in the sand filter?
Any help or thoughts will be appreciated.