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---- Green Algae: A very common variety, It is often found floating free in the water, and also clings to the pools walls. Unlike severe copper precipitation green algae reduces water clarity, Green algae's also appear as "spots" on surfaces, in rough places, or areas where circulation is low.

Yellow Algae: This variety of algae clings to walls and is also referred to as mustard algae. It is generally found on the shady side of the pool, is sheet forming, and difficult to eradicate completely. This variety is resistant to normal chlorine levels and requires extra effort to eradicate.

Black Algae: the hardest algae to get rid of, Black algae has a root system and a protective waxy coating that makes eradication extremely difficult. Black algae appears as dark black or blue/green spots, about 3 or four millimetres across, They have roots that can extend into the plaster or tile grout, ----

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15y ago
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14y ago

Algae is further divided into different groups, which are the following:

dinoflagellates, euglena, diatom, green algae, red algae and brown algae

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11y ago

It completely depends on temperature, type of algae, and the amount of Phosfates in the water. Plus algae evolves on a yearly basis.

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Q: What are three main groups of algae?
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