Algae is the most common pool water problem only because it is the most visibly obvious one. Algae in itself is not dangerous — in fact, it is the main ingredient in many health supplements and tablets. Algae brings danger in that it converts sunlight into food, releasing wastes that become the feeding grounds for unwanted and harmful bacteria and other micro-organisms.
There are well over 20,000 species of algae, only a few of which are encountered in swimming pool water. Algae is almost constantly entering the pool, and as soon as the sanitizer level drops too low, the algae begins to take hold and multiply. It takes as little as a few hours on a warm sunny day for your sparkling pool to develop an algae problem. The algae “spores” found in the air are from algae that have dried out (at a nearby stream, from a neighbor’s pool, etc.) and become airborne with the breeze.
Types of Pool Algae
Algae in swimming pools is often referred to by its color:
- Green Algae-By far the most common and relatively easy to treat
- Yellow/ Mustard Algae-Troublesome to treat but also relatively susceptible to treatment
- Black Algae-Can be very difficult to get rid of, especially in plastered pools
- Pink Algae-Not an algae at all, it is a fungus called Paecilomyces lilacinus that causes slimy white, pink or grey colonies
What is the green algae in the corners of my pool?