How to Get Rid of Foam in a Swimming Pool

Removing the present foam with a skimmer is a solid start.
Removing the present foam with a skimmer is a solid start. (Image: Jupiterimages/Creatas/Getty Images)

It can be extremely frustrating to do your best to maintain your swimming pool, only to discover unsightly white, foamy slime on the surface of the water. Removing the foam from your pool takes a bit of effort, but once you understand what caused the foaming--whether low calcium, the wrong type of algaecide or a mechanical leak--you can take steps to prevent recurrence.

Things You'll Need

  • Pool skimmer
  • Pool test kit
  • Algaecide
  • Calcium pool supplements

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Use a pool skimmer on the surface of the water to remove all visible foam.

Use the pool test kit to assess the pool’s calcium content. Pool water with low calcium may produce surface foam. Add calcium-boosting chemicals to get a reading between 150 and 200 parts per million (ppm). The website Pool Wizard recommends adding calcium chloride to raise calcium.

Switch from quat and polyquat algaecides to copper-based algaecides to prevent pool foam, recommends the website Learn About Pools. While copper algaecides do not cause foam buildup, they can stain pool walls and floors if used improperly. The website Ask Alan a Question recommends installing a metal trap filter if your pool is prone to staining from copper algaecides.

Check your pool’s hoses, clamps and plumbing for air leaks. Air leaks can be plugged or replaced, depending on the mechanical part that has cracked. Leaks produce bubbly foam that is instantly remedied once the crack is mended.


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