Why Is my Saltwater Pool Green?

You squeeze into your swimsuit, grab your favorite book, slather up with sunscreen, and step onto the pool deck… only to see that your saltwater pool has turned green! You may be asking yourself, “Why is my saltwater pool green?” Let’s look at a few of the reasons why your pool has turned off-color.

9 Reasons Why a Saltwater Pool Can Turn Green

To prevent your tropical oasis from turning into a neon swamp, it’s important to regularly test and adjust salt levels, maintain appropriate pH levels, ensure proper circulation and filtration, and employ algaecides or shock treatments as needed. Proactive and consistent water care is key to preventing a green hue and maintaining the clarity and cleanliness of a saltwater pool.

Here are some of the most common reasons why a saltwater pool might turn green.

1. Algae growth

The most common reason for a saltwater pool turning green is the growth of algae. Algae can grow in a pool if the water chemistry is unbalanced, especially if the pH, alkalinity, or calcium hardness levels are too low or too high or if the chlorine levels are too low.

2. Low chlorine levels

Chlorine is the primary sanitizer used in pools, and if the chlorine levels are too low, it can lead to algae growth and other water quality issues. This can be caused by a malfunctioning salt chlorine generator, improper use of chemicals, or insufficient water circulation.

3. High levels of phosphates

Phosphates are a nutrient that can promote algae growth in a pool. They can enter the pool through various sources, such as fertilizer, leaves, or other debris. If the phosphate levels in the pool water are too high, it can lead to the growth of algae.

4. High levels of nitrates

Nitrates are another nutrient that can promote algae growth in a pool. They can enter the pool water through various sources, such as rainwater or fertilizers. If the nitrate levels in the pool water are too high, it can lead to the growth of algae. Did you fertilize your yard lately? If so, that could be the culprit.

5. High levels of metals

High levels of metals, such as iron or copper, can cause discoloration in the water and lead to algae growth. These metals can enter the pool water through various sources, such as source water or metal pool equipment.

6. Poor filtration and circulation

Proper filtration and circulation are essential for maintaining clear pool water. If the pool’s filtration and circulation system are not working correctly, it can lead to stagnant water, which can promote algae growth and other water quality issues. Your pool pump should run on high 24/7 to clear a green pool.

7. Poor maintenance

Regular pool maintenance is critical to preventing algae growth and other water quality issues. Neglecting regular maintenance tasks, such as brushing and vacuuming the pool, can lead to the buildup of debris and other contaminants in the water, which can promote algae growth.

8. Weather conditions

Weather conditions, such as heavy rain or extended periods of hot weather, can affect the pool’s water chemistry and promote algae growth.

9. Inadequate salt levels

Saltwater pools use salt chlorine generators to produce chlorine for sanitizing the water. If the salt levels in the pool water are too low, it can lead to insufficient chlorine production, which can promote algae growth and other water quality issues. Be sure to test your salt level.

Final Word: Why Is Your Saltwater Pool Green?

A saltwater pool turning green is often due to an imbalance in the pool’s water chemistry. While saltwater pools rely on a salt chlorination system to generate chlorine and sanitize the water, they still require proper monitoring and maintenance. A few simple adjustments can turn that green goop back into your aquatic retreat.

Check out these additional facts about saltwater swimming pools and our saltwater pool FAQs!

If you’re considering installing a new inground swimming pool, choose the most trusted pool contractors in North Carolina. Call us, schedule an appointment online, or visit our pool design center in Benson, NC. Let’s dive in together!