Why Would a Swimming Pool Have Permanent White Circular Spots on the Bottom of the Pool?

Permanent white circular spots on the bottom of a swimming pool are often caused by calcium buildup. Calcium is a common mineral found in water, and when it combines with other minerals, it can form a hard, white deposit called calcium scale. Calcium scale can build up on any surface in a swimming pool, including the bottom, sides, and steps.

There are a few factors that can contribute to calcium scale buildup, including:

  • High calcium levels in the water. The higher the calcium level in the water, the more likely it is that calcium scale will form.
  • High pH levels. Water with a high pH level (above 7.6) can cause calcium carbonate to precipitate out of solution and form calcium scale.
  • Low water circulation. Water that does not circulate properly is more likely to allow calcium scale to form.
  • Hard water. Hard water contains a high concentration of dissolved minerals, including calcium.

Calcium scale can be a nuisance, but it is not harmful to swimmers. However, it can make the pool look unsightly and can make it difficult to clean.

How to Remove Calcium Scale

There are a few different ways to remove calcium scale from a swimming pool. One option is to use a commercial calcium scale remover. These products are typically acidic and can dissolve calcium scale. Another option is to use a vinegar and water solution. To make a vinegar and water solution, mix one part vinegar with one part water. Pour the solution over the calcium scale and allow it to sit for several hours. The vinegar will help to dissolve the calcium scale.

How to Prevent Calcium Scale

There are a few things you can do to prevent calcium scale from forming in your swimming pool.

  • Keep the calcium level in the water low. You can do this by using a water softener or by adding a calcium sequestrant to the water.
  • Maintain a proper pH level. The ideal pH level for a swimming pool is between 7.2 and 7.8.
  • Ensure that the water circulates properly. This will help to prevent calcium scale from forming on the bottom of the pool.
  • Use a scale inhibitor. Scale inhibitors are chemicals that help to prevent calcium scale from forming.

Related Questions

  1. What is calcium scale? Calcium scale is a hard, white deposit that can form on surfaces in a swimming pool.
  2. What causes calcium scale? Calcium scale is caused by a combination of high calcium levels, high pH levels, low water circulation, and hard water.
  3. How can I remove calcium scale? You can remove calcium scale by using a commercial calcium scale remover or a vinegar and water solution.
  4. How can I prevent calcium scale? You can prevent calcium scale by keeping the calcium level in the water low, maintaining a proper pH level, ensuring that the water circulates properly, and using a scale inhibitor.
  5. Is calcium scale harmful to swimmers? No, calcium scale is not harmful to swimmers.

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