Eradicating White Water Mold from Your Above Ground Swimming Pool

A Step-by-Step Guide to Identifying, Treating, and Preventing White Water Mold in Home Pools


White water mold is a common issue faced by many above ground swimming pool owners. This stubborn fungus appears as a white, slimy substance that can cling to pool surfaces and equipment, causing unsightly and unsanitary conditions. In this article, we will provide a comprehensive guide to identifying, treating, and preventing white water mold in your above ground swimming pool.

Identifying White Water Mold in Your Swimming Pool

White water mold appears as a white, cotton-like substance that can be found floating on the water’s surface or clinging to pool surfaces such as walls, floors, and equipment. It is often mistaken for algae but has a distinct slimy texture. White water mold thrives in pools with poor water circulation, low sanitizer levels, and inadequate filtration.

Treating White Water Mold in Your Above Ground Swimming Pool

  1. Remove Visible White Water Mold: Start by manually removing as much visible white water mold as possible using a pool brush, skimmer net, or a cloth. Focus on cleaning all affected surfaces and equipment, including skimmer baskets, pumps, and filters.
  2. Shock Your Pool: After removing the visible white water mold, shock your pool with a high-quality pool shock treatment. Follow the manufacturer’s instructions for the proper dosage and application procedure. Shocking your pool helps eliminate fungi, bacteria, and other contaminants, including white water mold.
  3. Balance Your Pool Water: Test and adjust your pool water chemistry to maintain optimal levels:
    • pH: 7.2-7.8
    • Total Alkalinity: 80-120 ppm
    • Free Chlorine: 2-4 ppm
    • Calcium Hardness: 200-400 ppm
  4. Improve Filtration: Clean or replace your pool filter cartridge, and consider upgrading to a higher-capacity filter if necessary. Proper filtration is crucial for preventing white water mold growth.
  5. Vacuum and Brush Your Pool: Thoroughly vacuum and brush your pool to remove any remaining white water mold and debris. Pay special attention to areas where white water mold was previously present.
  6. Clean Pool Equipment: Disassemble and clean any affected pool equipment, such as skimmer baskets, filters, and pumps, to ensure all traces of white water mold are removed.

Preventing White Water Mold in Your Above Ground Swimming Pool

  1. Maintain Proper Water Chemistry: Regularly test and adjust your pool water chemistry to maintain a balanced and sanitary swimming environment.
  2. Maintain Sanitizer Levels: Ensure your pool’s sanitizer levels are within the recommended range, whether you use chlorine or an alternative sanitizer.
  3. Regular Pool Maintenance: Perform routine pool maintenance, including vacuuming, brushing, and skimming, to prevent the accumulation of debris and contaminants that can contribute to white water mold growth.
  4. Optimize Water Circulation: Ensure your pool’s pump and filter system is working efficiently to maintain proper water circulation, which can help prevent white water mold growth in low-flow areas.
  5. Shock Your Pool Regularly: Shock your pool on a regular basis, especially after heavy use or severe weather, to keep contaminants at bay and discourage white water mold growth.


White water mold can be a persistent and troublesome issue in above ground swimming pools, but with the proper identification, treatment, and prevention measures, it can be effectively managed. By maintaining a balanced and clean swimming environment and following the steps outlined in this article, you can enjoy a clear, sparkling pool free of white water mold and other contaminants, ensuring a safe and enjoyable swimming experience for you and your family.