microscopic plants deposited in pool or spa water by wind, rain and dust, they thrive in sunlight and warm water, clogging pool equipment and causing slippery surfaces and green water; there are 21,000 known species of algae
algae are not disease causing, but can harbor bacteria, and it is slippery
most common pool types are black, blue-green, green and mustard (yellow or drawn)
pink or red-colored algae-like organisms exist but are bacteria and not algae; maintaining proper sanitizer levels, shocking and superchlorination will help prevent algae occurrence
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