Common types of algae in swimming pools:

Green Algae

Green algae is probably the most common variety to plague swimming pools. Signs of an impending algae bloom can include hazy water conditions, poor filtration, or a lack of sanitizer. This type of algae is frequently seen free floating in the water, although it has been known to attach to walls, water features or even pool equipment. Severe cases may also result in a total takeover of all of the pool surfaces, covering them in a gross green slime.

Yellow Algae

Yellow algae, also referred to as mustard algae, usually starts out on the shady side of pools, forming in sheets along pool surfaces. Once a mustard algae bloom has occurred, re-blooms may continue to occur frequently, and entire seasons may be spent fighting it off. Normal sanitizer levels are not sufficient to completely eradicate this problem and further action must take place.

Black Algae

Black algae is most commonly seen within plaster pools. The plaster provides ideal conditions for strong roots to attach themselves, making it extremely difficult to remove. Black algae usually appears as black spots about the size of an eraser head, and may appear in clusters or patches. Unless frequent brushing takes place along with elevated levels of sanitizer to ensure all roots have been completely destroyed, a new head will grow in the exact same spot.

No matter what type of bloom you may have, the faster treatment begins, the easier the battle will be. Controlling algae has never been easier!


Algae Break 90 is a non-staining formula that can be used against blue-green, black and mustard algae. This unique formula requires only a single dose which lasts up to 3 months.

Dosage Rates:

Every Three Months: 16 fl.oz. of Algae Break 90 per 10,000 gallons of pool water (or 500mL per 40,000L) will prevent algae growth in all pool types.

Severe Algae Treatment: 32 fl.oz. of Algae Break 90 per 10,000 gallons of pool water (or 1 L per 40,000 L).