What is the best entity to use on black algae contained by a concrete in-ground pool? There is a black outline around one of the drains at the...

There is a black outline around one of the drains at the bottom on my pool, is it black algae,if so how do I get rid or it?
Should I plant my hose down lilies...
Answers:    you can rub the algae with a chlorine tablet to murder it,then use a silver based algaecide as a preventative
Why are the leaves on my yard garden...
Black algae is one of the most difficult variety to control and eliminate. This algae can appear as a blackish discoloration or a tar-like deposit. In either luggage, it is a problem to remove because of the physical nature of this algae. It has, as its outermost surface, a deposit of polymucosaccharide. This can act as a water repellent hedge and shield the underlying algae from contact with the chemically-treated water. In calculation to shock treatment and application of a polymer algaecide, it is recommended that the pH be dropped to 7.2, the circulation be directed towards the affected areas and a "quat" algaecide be added. The addition of the "quat" algaecide will not assassinate black algae, but it can act as a wetting agent that will backing the chemicals penetrate through the polymucosaccharide barrier. This regimen should be used near all types of algae that appear to be resistant to normal treatment, regardless of the color. Not adjectives black stains are caused by black algae: heavy metal discoloration and plaster finish problems are other possibilities.
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You own split main drains in your pool. 2 that is to say? I don't think it is algae but something else. Get a swim mask on and stir see what it is.

Black algae is usually in spots or patches.

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