Types of Pool Algae and How to Eliminate Them

Types Of Algae

What is Algae?

Algae are microscopic plants that can enter your pool by natural elements, such as rain and wind. They can also attach to something as common as beach toys or swimsuits. These micro-plants can quickly multiply and bloom into a big eyesore. This can pose a large problem for your pool surface and equipment if untreated.

What are the most common types of algae in swimming pools?


This is the most common algae in residential swimming pools. It can be seen floating in the water and turning the water a hazy-green. Green algae can spread to the pool walls, floor and stairs. You can treat green algae with algaecide, shock and the right amount of brushing.

We recommend ABC: Attack, Brush and Circulate:

Attack the algae with shock/chlorine.
Brush the walls, steps and ladder.
Circulate the water by keeping your pump and filter running.
– Repeat as needed.


This algae is less common and more difficult to combat than Green algae. The rough surface of concrete or plaster pools make for the perfect home to sink its deep roots. Black algae may not affect the water clarity, but can create black spots on the pool floor and walls.

Quick tip – Always rinse your bathing suits, beach toys and floats after hitting the beach.


This algae is commonly mistaken for dirt, sand or pollen. It is usually found in shady parts of the pool. Pollen is a good imitator of mustard algae, but won’t cling to the walls. Pollen can also be seen everywhere (not just shaded areas).

Quick tip – When vacuuming your pool of algae, set the filter to waste. Algae can live in pool equipment, so you will want the dirty water to bypass the pool filter. Remember to fill your water to the top before sending the dirty water to waste.

What causes algae in pool water?

1) Low Chlorine levels
2) Sunlight
3) Heat
4) Heavy pool usage
5) Vegetation in the pool

Algae is typically caused by a lack of proper filtration or sanitation. Proper and consistent cleaning will greatly reduce algae growth in your swimming pool. Daily circulation and balanced chemicals will also help keep your water in check. A wise man once told me, “A stagnant pool is nothing less than a swamp.”

Quick tip – Take extra precaution when cleaning your pool after a pool party or bad weather. We recommend boosting the chlorine levels by using shock. Shock works best if you pour it in the water at night, eliminating the risk of burn-off from sun and heat. Make sure to brush the walls, vacuum and run the circulation before shocking your pool.

Oh, no, it’s too late! What tools do I need to remove algae?

Algaecide: EasyCare’s AlgaTec can quickly and effectively remove algae using chlorine synergy. This product can end and control green, black and mustard algae types.
Shock: There are three major types of pool shock: Cal-Hypo, Di-Chlor, and Chlor-Free. All three can be effective in eliminating algae in the right circumstance.
Cleaning Brush: Every pool brush is not made equal! The same goes for every pool surface. Soft, nylon brushes work well for vinyl-lined, fiberglass, acrylic or painted pools. Wire brushes are the perfect tool to clean plaster and concrete pools.
Pool Perfect Plus PHOSfree: This natural product can reduce the phosphates levels in your pool.
Chlorine Tablets: These high-density tablets ensure consistent dissolution and long-lasting protection for your pool.

To summarize, pool algae prevention begins with testing your pool water at least once a week. Keep your water clean and moving to help prevent algae from every day! Happy swimming!