You’ll fail if you treat cyanobacteria like garden-variety green algae. The bacteria even shoots its roots down into cracks, making it even harder to eradicate. Instead, it prefers rough surfaces such as concrete, gunite, or plaster pools because they have porous surfaces the organism can stick to. You won’t find it as much in pools with vinyl or fiberglass liners. This means little or no freshwater, algaecide, or sanitizer gets there.
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These are usually areas of your pool where the circulation is poor. You’ll often find black algae in areas such as along a wall, in the deep end, in a corner, or around steps or ladders. It may appear more blue-green than black. Then, you’ll need to take decisive action to get rid of it.Ĭyanobacteria looks like a bunch of tiny black dots or huge mold clumps with raised heads that adhere to surfaces (it’s not free-floating). To keep you and your family safe, you’re going to need to be able to identify black algae as soon as it rears its ugly head. The aquatic pest can even get into your pool if airborne spores of the species happen to be wafting your way (although this is an exceedingly rare occurrence). It’s way easier to transfer from a pond or lake than you probably ever realized.Ī black algae infestation can happen if someone uses a pool float in a lake or the ocean without spraying it off thoroughly with a garden hose. From chic bathing suits to swim-happy pets, black algae has a whole host of vehicles it can use to hitch a ride to your backyard swimming hole. If you’re recently taken a dip in the ocean, a lake, or other natural body of water and then jumped into your pool, you’re at risk of introducing black algae to it. It can inhabit fresh- and saltwater, as well as damp soil and rocks. It’s blue-green in color but appears black because it contains other water-soluble pigments that combine with blue-green to make it appear black.
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Like most other plants on the face of the planet, green algae uses chlorophyll to perform photosynthesis, the process by which plants use to manufacture food from carbon dioxide and water.īlack algae isn’t really algae - it’s a single cell organism known as cyanobacteria. Algae is a type of aquatic plant and can be everything from tiny single-celled organisms to seaweed.