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How Does Rain Affect My Pool Water?

This is a very common question among pool owners. They ask us, “is there anything I should do to my pool after it rains?” It’s a good question and the answer is YES! There are a few things you should check after a heavy rain.

Rainwater can sometimes affect your pool’s water chemistry. Rain is known to have acidic properties that can negatively impact your pool water chemistry balance. Rainwater can affect the pH balance, alkalinity levels and more. After a heavy rain, you also have a lot of extra water in the pool that can dilute the chemistry and chlorine levels.

The extent of the chemistry issues you’ll experience will depend on how much rain you get. A light rain, for example, should have very little affect on your pool water. But to be on the safe side, it is always best to be certain that your pool water chemistry is properly balanced at all times.

How Does Rain Affect My Pool Water?

Heavy Rain - What Should I Do Now? 5 Tips

Keep ahead of the changes to your water by testing frequently during heavy rain periods. After a heavy rainfall, follow these simple steps.

1. Clean the pool if the rain came with heavy winds that could blow dirt, leaves, or other debris into your pool. Skim the pool and the vacuum with an automatic pool cleaner or manually vacuum the pool.

2. Run your pump for at least 12 hours a day to ensure proper filtration and circulation. This helps remove dirt and debris, along with circulating the existing chlorine in your pool.

3. Next you want to check the water chemistry with test strips, especially the pH, alkalinity and sanitizer levels. Acidic rain can cause your pH to drop. Note: Your alkalinity levels might see a more drastic change than your pH levels.

Keep a close eye on your chlorine or sanitizer level. It common for chlorine levels to drop so low that it leads to cloudy water or algae.

Smart Tip: Speak to a local pool professional for assistance on re-balancing your pool water after a heavy rainstorm.

4. Watch you water levels. You want to drain excess water, bringing your water to an appropriate level for proper skimming. If you have a Diatomaceous (D.E.) or Sand Filter with a multi-port valve, you can simply put it from vacuum to waste mode, or just let the pool drain until it’s back at the normal level.

5. Shock your pool after heavy rains in the evening. This will fight off issues with what the rain has brought into your pool and reduce the risk of cloudy water or algae due to low chlorine levels.

Want Free Advance From Experts? If you need some additional help or have questions just call PleatcoCare at 800-886-5160 or email us at

Have a great summer by the pool!!!

Pleatco Pure – The Clean Water Company

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