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What is the best way to kill Black Algae?

No matter how much acid I use, it doesn't go any higher than 6.5. My pool is pebble tech with a SWG and is 12,000 gallons. I live in Arizona and pool temp is at 80 degrees I used 2 different pool testing kits to test the water. Last summer I had a problem with black mold from high nitrates...

Leslie's Copper Algaecide. is this ok to use ? I question the Copper. I have Black or very dark algae.

Richard Thank You for your time !!!!!!!

Richard here is a photo of my equipment. Only 1 valve for skimmer and vacuum. Pool was built 1998 same as house.

Not sure what you mean by recirculate. Backwash?

The weir down no change in basket. Still lazy flower pedals making laps.

Thanks Richard, 2 new O rings at pump skimmer and filter lid. Pool water is right, removed the Skim around and put old skimmer basket in. White water is still there just not as bad. I have bled the filter air bled several times, still getting burst of air and water, bled about 5-8 gallons of...

I just changed the sand in my filter. I followed the instruction to the letter, after backwashing before putting the filter in service I now have white water at the pump skimmer and when the pump shuts off the skimmer basket in the pool shoots all the leaves back into the pool. It seems like I...

Pool is 13,000 gals. IG/pebble Hayward sand filter Hayward pump single speed Pool built in 2006 ? Using Taylor K2006/Taylor 1766 2 week old Pintar IC60 SWG

Thanks, I do have the K1766 as well. Just wanted to make sure the K2006 was the right kit for the rest of the testing.

Which test kit is the right one for salt water pools? I have the K2006.