Asked in
Swimming Pools

What causes black algae in swimming pools?


User Avatar
Wiki User
July 09, 2009 11:18AM

I have been in the pool business for about 20 years now. From my best knowledge it seems to come from lakes or pond. It get transfered into your pool from dog in the lake/pond into the pool or bathing suits that have been to the lake/pond and then into the pool. Just remember to keep your lake suits separate from your pool suits. I always keep extra suits at my house for friends that come over to swim or have them leave there suits here so I know they do not get lake water into the pool. I know a lot of you are saying that "I wash my suits after we get home from the lake"..... this does not matter black algie does not die from a machine wash and dry. My wife and I are the only users of our pool and we've never been to the lake or river so I'd like to know how black algae got into my pool? - ttwotees