Common Types of Algae in Pools
Common Types of Algae in Swimming Pools
Green algae, the most common type of algae seen in pools, is a result of unbalanced chemicals that allows build up in the water to grow. This type of algae is easily treated with higher levels of chlorine, or “shock”, to ensure it dies and does not continue growing. In addition to maintaining proper chemical balance, brushing your pool’s walls and flat surfaces such as wet decks, seating, and steps will help ensure that green algae does not grow in your pool. Brushing is included in both of our weekly pool service packages for these reasons.
Mustard algae is a chlorine-resistant type of algae that is easy to spot because of its “mustard” yellow color. It can also look like sand or dirt on sides and bottoms of pools. It can survive in well balanced water and even in highly chlorinated conditions. This factor can even create a large chlorine demand in certain situations. Mustard algae can be brushed away very easily, but returns quickly. Mustard algae is easily spread from lakes and oceans to pools, as well as pool to pool.
Black algae are single-celled organisms that grow in large colonies. They contain chlorophyll like other algae, but they also contain compounds that mask the green color. It can root itself in cracks and crevices on pool surfaces (especially plaster finishes) and can grow somewhat protected from the surrounding environment due to the formation of a waxlike protective layer on the outside of the cell. This makes black algae more difficult to treat. It is also somewhat resistant to normal chlorine levels. Black algae is easily spread from lakes and oceans to pools, as well as pool to pool.
Mustard and Black algaes are both chlorine resistant, as already mentioned, and require special treatments and longer-term maintenance to keep your pool clear. Both types of algae are easily transported or transferred from lakes and oceans to pools as well as pool to pool through swimsuits, towels, floats, toys, goggles, pets, etc. These types of algae may require filter cleanings and/or replacing filter cartridges or DE grids depending on the severity.
Pink or Red algae is a growth of pink, slimy bacterial matter which can sometimes occur in pools. The name is a misnomer though - pink algae is not a true algae. It is actually caused by bacteria. It is a sign of poor water maintenance, inadequate water circulation, and insufficient sunlight exposure. Rainwater can also contribute to its growth. Pink algae often grows on plastic parts such as skimmers and skimmer baskets. If pink algae is present for too long, pool water may turn brownish color. Like mustard and black algae, pink algae is chlorine and bromine resistant and requires proper treatment. Red or brown water indicates a high concentration of metal ions and the presence of algae. These adhere to pool surfaces and can create indelible stains if the water is not treated with urgency.
White algae will grow in shady areas of the pool and often looks like white fuzz or absorbent cotton. It is easily brushed off of walls and surfaces, and is
Did you know? Unwanted algae, such as mustard algae and black algae, can be transported from lakes and oceans to your pool on your swimsuits, towels, goggles, toys, pets, etc. It is very important to wash all of these items in hot soapy water before allowing these items back into your pool. This can help avoid transfer of unwanted algae that can result in costly remediation.
We have experience AND success with getting rid of these types of algae in pools, so give us a call at the first signs of algae to avoid its spread and costly treatments!
