What causes a pool liner to turn white?

1. Calcium buildup: Calcium deposits, also known as scale, can form on the pool liner over time when the water is heated or has a high calcium content. This can create a white or chalky appearance.

2. Chemical imbalance: An imbalance in pool chemicals, particularly low pH levels or high chlorine levels, can cause the liner to fade or become discolored, including turning white.

3. Sun damage: Prolonged exposure to the sun's ultraviolet (UV) rays can degrade the pool liner, leading to discoloration and fading, including a white appearance.

4. Algae growth: Algae can grow on the pool liner, giving it a white or cloudy appearance.

5. Poor maintenance: Neglecting regular cleaning and maintenance of the pool, including proper filtration and chemical balancing, can contribute to the deterioration and discoloration of the pool liner.

6. Certain pool chemicals: Some pool chemicals, such as clarifiers or flocculants, can leave a white residue on the pool liner if not used properly.

7. Liner material: The type of pool liner material can also affect its susceptibility to turning white. For example, vinyl liners may be more prone to discoloration than fiberglass or concrete liners.

8. Age and Wear: As pool liners age, they may begin to show signs of wear and tear, including discoloration.

To prevent the pool liner from turning white, it's important to maintain proper water chemistry, clean the pool regularly, protect the pool from excessive sunlight, and follow the manufacturer's recommendations for the pool liner. If the pool liner has already turned white, it may need to be cleaned and treated, or in severe cases, replaced.