How Rain Affects the Water in Your Swimming Pool


Having a swimming pool sometimes means that the inevitable will happen – it will rain and rainwater will be mixed together with the pool water inside of your swimming pool. There are several things that happen to the water in your swimming pool when it is mixed with rainwater, some good things, and some bad things.

Rain and Pool Water Chemistry

When you mix rainwater and pool water together you immediately effect the pool’s chemistry. They act together in a way that produces instant differences in the swimming comfort and sanitary conditions. The rainwater has the potential to dilute the pool water’s stability with the chemical set-up.

Rain will cause the Potential Hydrogen (pH) level of the pool water rise immediately and also reduces the Total Alkalinity (TA) because of dilution. Having a higher pH will actually cause more chlorine in the pool water to become dormant, which in turn will reduce its effectiveness. The lower the amount of TA, the more destabilizes the pH and it will keep climbing higher and higher.

Effects on Sanitation and Comfort

Chlorine is in the pool water for one reason – to kill any germs that may be present in the pool. With the pH level climbing to unstable values, the ability of the chlorine to kill germs is drastically reduced. The rainwater causing a higher pH will also effect the swimming comfort. Since the pH level for the human body is between 7 and 7.8, if the pool water goes out of this range, the water begins to irritate the skin and the eyes. Most pools are kept between these levels to ensure that the chlorine’s power to kill germs effectively is used efficiently to reduce the irritations to the eyes and skin.

What Do I Do after the Rainstorm is over?

After the rain is gone, it’s time to get your pool back into proper shape. First you need to get the water to the appropriate level. This may mean that you will need to drain some of the water if you receive a bunch of inches of rain. Once the rain is back down to the appropriate level, then you should check filter and make sure that you have good circulation. Clean out any debris that might have gotten stuck in the filter from the storm. Next, it’s time to test the chlorine and the pH levels.

The pH levels of your pool are the key to figuring out if the chlorine in your pool water is “asleep.” After you have tested the pH, if you find that the level is above 8.0, you will need to shock your pool water because the chlorine has definitely fallen asleep and will not combat the fight of algae growing inside of the pool. You will need to get the TA level back down to 80 to 120 for the pH to be stabilized.

The last step is to leave your equipment running. The water needs to circulate and get filtered as many times as it can before you turn the system off. You will need to do this because it will bring the chemistry in your pool back to a perfect balance.

When you need to have your pool service completed, call Texas Pool Professionals. They will help you restore the balance in your pool after a heavy rain storm. They are Texas’ most trusted pool service technicians and they will get your pool up and running for that next big pool party you’re throwing! Give them a call today!

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