Algae . . . or something else? Recognizing & treating pool algae successfully.

[PoolDoc]

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Algae . . . or something else?
Recognizing & treating pool algae successfully.

[ I'm still editing this, and will add more treatment info soon. But if you want to think about eliminating algae permanently, please read this post . ]

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A Quick & Basic Primer on Pool Algae

Algae comes in 3 main 'flavors': green, mustard, and black!

It's customary, when discussing swimming pool algae, to note that algae is a plant, and even to speculate on which species it is. This is a waste of time, though it took me years to learn that. As Wikipedia [June 2018] puts it, "No definition of algae is generally accepted.". That sounds about right, and is consistent with the things I've learned.

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But it means that there are no simple recipes for eliminating algae that work in every case. I can offer some usually correct guidelines for ID'ing algae. In fact, you can be pretty sure it IS algae, if

• The sides of your vinyl or fiberglass pool feel slimy (early stage biofilm formation), OR
• Your pool water is greenish AND hazy, OR [green algae]
• Your pool water is GREEN and cloudy, OR
• There are brownish, yellowish, greenish areas on the side of your pool, that float away when you brush them, but return the next day [ mustard algae ]
• When you smear the black goo, scraped from the black spots on your pool walls or tile grout, on to a white card . . . and the smear is dark green [ black algae ]

I'll think of some more, but that list covers the most common 'signs' of algae. I will also add and comment on photos of various types of algae.

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On the other hand, it's probably NOT algae if

• The pool water is greenish or GREEN, but CLEAR, OR
• The brownish or yellowish stains aren't changed by brushing, OR
• You can't scrape even a little 'goo' from the black spots.

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Dealing with algae is fairly simple in theory, if sometimes complicated in practice:

• Make sure it IS algae.
• Make sure the basics are right:
  • pH between 7.2 and 7.8;
  • chlorine above 2 ppm
  • pump ON and filter WORKING
• Kill the algae.
• Clean up the algae.

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The basics of pool chemistry are covered elsewhere, as are the basics of pump and filter operation, so I won't repeat them here.

The basics of killing algae are very simple: add more chlorine!

Here is a very important, very basic fact: chlorine is the STRONGEST, LEAST IRRITATING algaecide you can use!

I've tried them ALL: monochloramine (Yellow Out), sodium bromide (Yellow Treat), quaternary ammonia (soapy algaecide), copper (copper algaecides OR ionizers), silver (some rare algaecides OR ionizers), zinc (skimmer pills), and the one we've recommended, polyquat. I've even used a product now banned, Simazine.

Chlorine is MORE effective and causes FEWER problems than any of those. Well, polyquat doesn't cause problems, but it's also not super-effective.

Here's a breakdown:

• monochloramine -- temporarily VERY effective, but also VERY irritating.
• sodium bromide -- not generally effective, but has long lasting side effects
• quaternary ammonia -- not chlorine compatible; not super effective; fairly irritating.
• copper -- effective at high levels, but turns hair green and pools green, blue or black.
• silver -- effective against some strains, but is expensive and can turn pools gray or black.
• zinc -- not generally effective; can turn pools light gray.
• polyquat -- not as strong as chlorine, but no bad side effects.

That's it folks.

That's all the algaecides there are, except for chlorine. There "ain't no more": everything sold as a pool algaecide is one of those listed, or chlorine. (For those still confused . . . SALT pools ARE chlorine pools!)

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