Pool Care Information

Algae Prevention & Control

Sometimes, no matter how well you take care of your pool, algae can sneak up on you. The best preventive is the use of an algaecide as part of your routine maintenance program. While continuous chlorination and shock treatments help to control algae, applying an algaecide on a regular basis is the way to go.

Algae are tiny microscopic plants that enter your pool by rain, wind and fill water. If allowed to grow unchecked, your water will quickly become unusable. One ounce of water can contain millions of algae cells before they are visible. They can clog filters and reduce water circulation and effectiveness of pool chemicals. The main types of swimming pool algae are:

Green Algae: The most common type of algae. It’s also the easiest to prevent or eliminate. Green algae is free-floating, can turn a pool green in a matter of hours, and can be found in all types of pools.

Black Algae: A filamentous growth on the rough surfaces of the pool. It appears as black slippery spots on pool surfaces (walls and floor), and also forms a protective coating.

Mustard Algae: Appears as orange, yellow or mustard spots on pool walls and floors. It often forms on the shaded side of the pool. It’s an easy algae to brush off, but a difficult algae to eliminate. It can be found in all pool types.

If you already have an algae infestation, take action immediately. Different algae types may be more resistant, requiring specialized treatment. Treat these infestations with the appropriate algaecide product. Always add algaecides directly into the water, near visible algae growth. The day after treatment, brush walls and vacuum the pool thoroughly and begin using an algae preventive.

For specific algae treatments, click on one of the algae types below: