Why Is My Pool Green? Common Causes and Solutions

If you’re a pool owner, a green pool is one of the most frustrating crises you might encounter. Not only is it unappealing to look at, but it can also be a health threat for swimmers. If you ask yourself, “Why is my pool green?” This blog is for you.

There are several reasons why this occurs, and we’ll explore some of the most common causes in this article.

Keep reading this blog to find all the answers you are looking for regarding your pool needs.

What Causes a Green Pool?

Having a swimming pool in one’s backyard is a blessing, but maintaining it can be challenging. Sometimes, homeowners may notice that their pool has turned green. Although it is a common problem, it is not normal. A green pool is not only unappealing, but it is also a breeding ground for harmful bacteria if not treated properly. In this blog, we will discuss the reasons behind a green pool and how to fix it.

Furthermore, it is essential to understand the basics of pool maintenance. A pool needs several chemicals to be balanced for it to remain clean and clear. The four main parameters that require regular monitoring are the pH, total alkalinity, calcium hardness, and sanitizer level.

Here are some of the most common reasons:

Green Pool – Algae growth

The most common reason for a green pool is algae growth. Algae are microscopic plants that thrive in warm, sunlit water. If your pool has low chlorine or high pH levels, algae can quickly take over and turn your pool green.

Hence, it’s essential to maintain proper pool chemistry to prevent algae growth. You should regularly test your pool water and adjust the chlorine and pH levels. Additionally, you should regularly brush and vacuum your pool to remove any debris that might provide a breeding ground for algae.

Metals in the water

If your pool water has elevated levels of metals like copper or iron, it can cause your pool to turn green. Indeed, metals can enter your pool through various sources, including water supply, pool equipment, or even pool toys.

Regularly test your pool water for metal levels to prevent metal buildup. If you find high levels of metals, you can use a metal sequestering agent to bind the metals and prevent them from staining your pool.

Why Is My Pool Green? — Lack of sunlight

Sunlight is essential for chlorine to work effectively and kill off bacteria and algae. Believe it or not, lack of sun can cause your pool to turn green. Likewise, if your pool is shaded or covered by trees, it might not get enough sunlight to maintain clear water.

If lack of sunlight is the culprit, you might need to trim any trees or bushes blocking the sun. Alternatively, consider installing a pool heater to keep the water warm and encourage algae growth.

PH imbalance

As mentioned earlier, maintaining proper pool chemistry is essential to keeping your pool clear and blue. If your pool’s pH is too elevated or too low, it can cause the chlorine to be less effective and allow algae to grow.

To maintain proper pH levels, you should test your pool water regularly and adjust the pH as needed. A pH level of 7.4 to 7.6 is ideal for swimming pools.

Filter problems

If your pool’s filter isn’t working correctly, it can cause the green aspect. A clogged or dirty filter can’t effectively remove debris and algae from the water, allowing them to accumulate and turn your pool green.

You should regularly clean and backwash your pool filter to prevent filter problems. If your filter isn’t working correctly, you might need to replace the filter media or seek professional help.

How To Fix a Green Pool?

Green pools are not only unsightly, but they are also unhealthy. Here are some ways to fix a green pool.

Shocking the Pool

Shocking the pool with a high dosage of chlorine can eliminate the algae and other contaminants. It is recommended to shock the pool at night or when the sun is down since the UV rays break down the chlorine level. After shocking the pool, wait for 24 hours before trying to swim in it.

Brushing the Walls and Floor

Algae can adhere to the walls and floor of the pool. Brushing it helps to loosen up the algae and other dirt, making it easier for the chlorine to penetrate and eliminate them.

Maintaining Proper Chemical Balance

Maintaining the right chemical balance can prevent the pool from turning green in the first place. Make sure to monitor the chlorine levels, pH levels, and total alkalinity at least two times a week. Additionally, add algaecide once in a while to prevent the growth of algae.

Why Is My Pool Green? — Prevention Is Key

Preventing a green pool requires regular maintenance. Here are some tips to prevent it from turning green:

Regular Maintenance Schedule

Set a regular maintenance schedule, including cleaning and vacuuming the pool to remove dirt and debris. It is easier to maintain a clean pool than to try to bring it back from green.

Monitoring Chemical Levels

Checking the pH levels and chlorine levels regularly can help in catching any potential issues before they become a major problem.

Proper Filtration

Making sure the filtration system is working correctly can prevent the accumulation of dirt and debris, which can become a breeding ground for algae.

Professional Assistance with Your Pool Needs

A green pool can be caused by various factors, including algae growth, metals in the water, lack of sunlight, pH imbalance, and filter problems. The good news is that these issues can be resolved with proper maintenance and care. Regularly testing and adjusting your pool’s chemistry, cleaning and backwashing your filter, and keeping your pool exposed to sunlight are all essential steps to prevent your pool from turning green. Therefore, at Blue Pools & Spa LLC, we’re here to help you keep your pool clear and blue all season long.

Contact us today to learn more about our pool maintenance and repair services.