Algae is a common pool problem, especially in warmer climates like San Diego. It can quickly take over your pool if not addressed early. Here are the key signs you may have algae:
Discolored water (green, yellow, or cloudy)
Slimy or slick pool surfaces
Visible patches or streaks on walls, steps, or floors
Rapid chlorine loss despite regular dosing
Poor water circulation or filtration performance
Algae can be more than just an eyesore—it can damage pool surfaces, clog filters, and throw off your water chemistry.
Green Algae
The most common type
Turns water green and can spread quickly
Usually floats in the water or clings to walls
Often a result of poor circulation or low sanitizer levels
Yellow (Mustard) Algae
Appears as yellow or brown dust-like patches
Typically clings to shady areas or pool walls
More resistant to chlorine and can return easily if not treated thoroughly
Black Algae
Dark spots or patches with a protective outer layer
Grows deep into porous surfaces like plaster or grout
Very tough to eliminate and often requires brushing and chemical treatment
Pink Algae (technically not algae, but bacteria)
Slimy pink or red streaks often found around plumbing or in corners
Less common, but can be persistent without proper sanitation
At Next Level Pool Service, we know how to identify and eliminate all types of algae quickly and effectively. Whether it’s a green algae bloom or a stubborn black algae infestation, we use professional-grade treatments and proven techniques to restore water clarity and prevent future outbreaks—keeping your pool safe, clean, and swim-ready. Contact us online today or give us a call at 760-315-4379.
After trying to DIY my pool following online forums and YouTube videos, I couldn’t for the love of god get rid of the stubborn algae out of my pool. James came in, did his magic, my pool is now sparkling clean. Knowledge and experience are a key. They don’t just come in and clean your pool, they explain everything along the way. Highly recommended.
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