How to Clean Calcium Deposits off Fiberglass Pools

Written by april dowling | 13/05/2017
How to Clean Calcium Deposits off Fiberglass Pools
Promptly remove calcium deposits from fibreglass pools. (Swimming pool and pool house image by Jim Mills from

Swimming pools are popular backyard accessories for homeowners, and they come in many varieties. Unlike plaster and concrete pools, pools constructed from fibreglass are nonporous and require less brushing. However, calcium in pool water causes film, scum and lime scales on fibreglass walls. The longer these deposits remain, the harder they are to remove. Certain acid solutions are effective at cleaning calcium deposits from fibreglass pools.

Scrub the fibreglass with a soft pool brush. Remove as much calcium scale as you can with the brush.

Pour 1/2 cup of baking soda into a plastic bowl. Add 1/3 cup of white vinegar to the baking soda. Mix the solution with a spoon to form a thick paste.

Use a paper towel to apply a thick layer of paste to the remaining calcium deposits. Allow the paste to absorb into the calcium deposits for 10 minutes. Do not drain the pool water.

Spray water over the paste using a spray bottle. Scrub the calcium deposits with the pool brush.

Dampen a terry cloth with water. Wipe away the calcium residue and paste using the damp cloth. If some calcium deposits remain, repeat the cleaning process until the fibreglass is clean.


You can substitute lemon juice for white vinegar.

Tips and warnings

  • You can substitute lemon juice for white vinegar.

Things you need

  • Soft pool brush
  • 1/2 cup baking soda
  • Plastic bowl
  • 1/3 cup white vinegar
  • Spoon
  • Paper towel
  • Water
  • Spray bottle
  • Terry cloth

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