What Is Black Algae In a Pool?

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What is black algae in a pool?

What Is Black Algae In a Pool?

You know when you have algae in your swimming pool because the water turns a rather disgusting color of yellowish green. The green color can be light or dark, but it’s unmistakable. It is algae. When this happens, you may not excessively worry. It’s a common problem that can be easily remedied by properly shocking your swimming pool. But, what happens if you have black algae in your swimming pool? Are black algae in pools harmful to humans? What causes black algae in swimming pools? You might be alarmed if you see black algae. So, let’s answer some frequently asked questions.

Black Algae FAQs

  • How do you get rid of black algae in a swimming pool? Black algae are the hardest type of algae to eliminate from your pool, but it can be done. Pool shock will do the job, but you will have to shock your pool repeatedly, maybe as many as three or four times.
  • Why are black algae so hard to get rid of? They contain several layers that make it hard for chlorine to penetrate.
  • Where do I find them? Black algae tend to congregate in shady spots, such as around the stairs near the bottom or on the walls.
  • Why do black algae look stringy? Black algae have deep roots and can even grow into the concrete or plaster.
  • What causes black algae? Algae spores can be blown in from anywhere and then bloom because of unbalanced water, hot temperatures, poor water circulation or inadequate filtration. In addition, black algae frequently hitch a ride in the swimsuit of someone who has gone swimming in the ocean recently or on equipment used for pool cleaning that has been contaminated.
  • What feeds algae? Dissolved solids, debris, even the dead cells of other algae provide the food source.

The question on everybody’s mind is, of course, if black algae are dangerous to your health. Most people will tell you black algae are not dangerous. However, the truth is black algae can harbor nasty organisms, such as E. coli. The CDC in Atlanta says E. coli, which comes from feces, is the most common reason people get sick in swimming pools. Knowing black algae are like a magnet for it will make any pool owner shudder. The bacteria wash off and enter the water without being noticed. Somebody goes swimming and takes a big gulp of water and winds up with a serious gastrointestinal illness. That is not a fun scenario.

Black algae tend to attract insects as well. And, once your pool has been treated to eliminate black algae, the chemicals that were used present yet another hazard. The algaecide and shock circulate for many hours before the water balance returns to safe chemical levels.


Getting Rid Of Algae In Pool

Test and balance the water and check your pump and filter first. Open the valves on the pump to circulate the water as much as possible and let it run for a day. Backwash as needed and get ready to shock the pool by vacuuming and brushing. Brushing is super important when fighting black algae because they have layers. You will have to brush vigorously to destroy them and make sure you backwash the filter immediately afterward.

After brushing, crush up some tablets and sprinkle them directly on the black algae spots so chemicals can get to work. You will want to scrub the heads of the algae blooms and get some chlorine directly inside of them. A Trichlor stick or tablet works well for this. A follow-up dose of copper or strong polymer algaecide will also help. Just remember to use chemicals specifically made for pools, not for agriculture or ponds or lakes.


Let Us Help You Get Rid Of Black Algae In Your Swimming Pool For Good!

PoolKnights of Houston can help you. We are are a full-service pool maintenance company. We service the Houston, TX areas of Spring, and The Woodlands as well as surrounding areas.

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