Pool algae

Algae problems in swimming pool water.
Green (cloudy) water or slimy pool walls.
Black algae. Mustard algae. Pink or white pool mold.
The Ol Man

Pool algae

Postby The Ol Man » Mon 05 Sep, 2011 17:52

Hello Larry my daughter has been fighting pool algae since 1996. Test show excessive algae and local suppliers have recomended a number of chemicals which work but the algae continues to win. There are no trees near the pool, an often asked question. The above ground pool has a treated wood deck which is above the top of the pool. Is there a chance that water run-off from the deck is the problem?
Thanks in advance for your help. The Ol Man


chem geek
Pool Industry Leader
Pool Industry Leader
Posts: 2382
Joined: Thu 21 Jun, 2007 21:27
Location: San Rafael, California

Pool algae

Postby chem geek » Tue 06 Sep, 2011 01:44

It's more likely that you are using Trichlor pucks/tabs and that the Cyanuric Acid (CYA aka stabilizer or conditioner) level is very high. This makes the chlorine less effective. I suggest you get your own good test kit, either the Taylor K-2006 or the TFTestkits TF-100 . I also suggest you read the Pool School to learn how to properly maintain the pool, especially the appropriate Free Chlorine (FC) level for your CYA level.

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