Why Does My Pool Turn Green After It Rains?

Many pool owners have experienced the frustration of watching their pool turn green after a rainstorm. While it may seem like magic, there is a scientific explanation for this phenomenon. Rainwater is naturally acidic, and when it falls into a pool, it can lower the pH and phosphate of the water. This can cause your pool chemistry to become imbalanced, leading to the growth of algae and other microorganisms. In addition, rainwater can also introduce dirt and debris into the pool, which can further contribute to the problem. The good news is that this problem can be easily prevented!

How To Prevent Your Pool From Turning Green

Use a Pool Cover

One of the best ways to prevent your pool from going green is by using a pool cover. A cover will not only protect your pool from the elements, but it will also help to keep it clean and clear. So next time a storm is brewing, be sure to take the time to cover your pool.

Give Your Pool An Additional Shock After a Big Storm

If you like to maintain a minimal level of chlorine (0.5-1 PPM), chances are that when bacteria and other debris enters your pool it will use up all of the chlorine in your pool. As soon as chlorine levels are gone, algae begins to grow. By giving your pool an additional shock after a big storm it will help to balance your pH levels.

How To Fix Green Pool Water

If your pool has turned green, don’t worry! Here’s how you can get your water back to crystal clear:

Balance Your Chlorine and pH Levels

Your chlorine should sit between 1.0 and 3.0 PPM, and your pH levels should be 7.8 to 8.0.

Note: pH levels should sit between 7-7.6 when not treating algae.

Add acid or base and turn on your pump so that it can filter through the rest of the water.

Check Your Filters

Check your filters to make sure that they are clean and free of debris. Sticks, leaves, and other obstructions can cause it to become clogged and prevent any chemicals from working properly.

Scrub Your Pool Clean & Shock It 

Chlorine will get rid of algae, but algae that is stuck to surfaces prevents chlorine from working more quickly. Use a soft brush to gently loosen algae so that the chemicals can work quickly and efficiently.

If you are worried about keeping your pool balanced, bring a water test to our store at any time during store hours for free water testing or give us a call and schedule a consultation.

Above all else, we recommend installing a pool cover as it will save you a lot of headaches (and pool-cleaning) in the long run. If you don’t have a pool cover, or need a replacement, visit us at the store or give us a call and we’ll find the right cover for you.