How do I clean a pool that has a lot of stains on the tiles?

Nov 19, 2025

Cleaning a pool with a lot of stains on the tiles can be a challenging yet rewarding task. As a professional in the cleaning pool industry, I've encountered numerous pools with stubborn tile stains over the years. In this blog, I'll share my expertise on how to effectively clean a pool with heavily stained tiles, along with some insights into the tools and techniques that can make the process easier.

Understanding the Types of Stains

Before diving into the cleaning process, it's crucial to understand the different types of stains that can appear on pool tiles. Common types of stains include:

  1. Calcium and Mineral Deposits: These stains are often white or off - white in color and are caused by the buildup of calcium and other minerals in the pool water. They can occur due to hard water, improper water chemistry, or evaporation.
  2. Algae Stains: Algae can grow on pool tiles, especially in areas with poor circulation or low chlorine levels. Algae stains can range from green to black and can be slippery and unsightly.
  3. Rust and Metal Stains: Rust stains are typically brown or orange and are caused by the presence of iron or other metals in the pool water. Metal stains can also be caused by corroded pool equipment or the use of metal objects in the pool.
  4. Organic Stains: These stains are caused by the presence of organic matter such as leaves, dirt, or body oils in the pool water. Organic stains can be brown, yellow, or black and can be difficult to remove.

Pre - Cleaning Preparation

Before starting the cleaning process, it's important to take some preparatory steps:

1Bubble Cleaning Machine

  1. Drain the Pool: If the stains are severe, it may be necessary to drain the pool partially or completely. This will allow you to access the tiles more easily and apply the cleaning solutions directly to the stains.
  2. Gather Cleaning Supplies: You'll need a variety of cleaning supplies, including a pool brush, a tile cleaner, a pressure washer (optional), safety goggles, gloves, and a respirator mask if using strong chemicals.
  3. Test the Water Chemistry: Check the pool water chemistry to ensure that the pH, alkalinity, and chlorine levels are within the recommended range. Adjust the water chemistry as needed to prevent further staining.

Cleaning Techniques for Different Types of Stains

Calcium and Mineral Deposits

  • Vinegar Solution: Mix equal parts of white vinegar and water in a spray bottle. Spray the solution onto the stained tiles and let it sit for 15 - 20 minutes. Then, scrub the tiles with a pool brush. The acid in the vinegar will help dissolve the calcium and mineral deposits.
  • Commercial Tile Cleaner: There are many commercial tile cleaners available that are specifically designed to remove calcium and mineral deposits. Follow the instructions on the product label carefully.

Algae Stains

  • Chlorine Shock Treatment: Add a high - dose of chlorine to the pool water to kill the algae. Brush the stained tiles vigorously to loosen the algae. After the shock treatment, vacuum the pool to remove the dead algae.
  • Algae Cleaner: Use a commercial algae cleaner that contains algaecides. Apply the cleaner to the stained tiles according to the product instructions.

Rust and Metal Stains

  • Ascorbic Acid: Dissolve ascorbic acid tablets in water to create a solution. Apply the solution to the rust stains and let it sit for a few hours. Then, scrub the tiles with a pool brush. Ascorbic acid can help break down the rust.
  • Metal Sequestrant: Use a metal sequestrant to prevent further metal staining. Follow the instructions on the product label for proper dosage and application.

Organic Stains

  • Enzyme Cleaner: Enzyme cleaners are effective at breaking down organic matter. Apply the enzyme cleaner to the stained tiles and let it sit for the recommended time. Then, scrub the tiles with a pool brush.
  • Pressure Washing: For stubborn organic stains, a pressure washer can be used. However, be careful not to damage the tiles with excessive pressure.

Using Specialized Cleaning Equipment

In addition to traditional cleaning methods, there are some specialized cleaning equipment that can be very helpful in cleaning pool tiles:

  • Garlic Washing Machine: Although it may seem an unusual name, this machine can provide a gentle yet effective cleaning action. It can be used to agitate the cleaning solution around the tiles, helping to loosen and remove stains more efficiently.
  • Garlic Disinfection Tank: This tank can be used to store and prepare cleaning solutions. It can also help in disinfecting the cleaning agents, ensuring a more hygienic cleaning process.
  • Bubble Cleaning Machine: The bubble cleaning machine creates a stream of bubbles that can penetrate deep into the pores of the tiles, dislodging dirt and stains. It is a great option for hard - to - reach areas and for a more thorough clean.

Post - Cleaning Steps

After cleaning the pool tiles, it's important to take some post - cleaning steps:

  1. Rinse the Tiles: Thoroughly rinse the tiles with clean water to remove any remaining cleaning solution or debris.
  2. Refill the Pool: If the pool was drained, refill it with fresh water.
  3. Balance the Water Chemistry: Once the pool is refilled, test the water chemistry again and adjust the pH, alkalinity, and chlorine levels as needed.
  4. Maintain Regular Cleaning Schedule: To prevent future staining, establish a regular pool cleaning schedule. This includes skimming the surface, brushing the tiles, and vacuuming the pool on a regular basis.

Conclusion

Cleaning a pool with a lot of stains on the tiles requires patience, the right tools, and the proper techniques. By understanding the types of stains and using the appropriate cleaning methods, you can restore your pool tiles to their former glory. As a cleaning pool supplier, I'm always here to provide you with the best products and advice for your pool cleaning needs. If you're interested in purchasing any of the cleaning equipment or products mentioned in this blog, or if you have any questions about pool cleaning, please feel free to contact us for a procurement discussion.

References

  • "Pool Care Handbook" by Pool & Spa News
  • "The Complete Guide to Pool Maintenance" by Leslie's Pool Supplies