How to Prevent your Pool from Turning Green After a Rainstorm

How to Prevent your Pool from Turning Green After a Rainstorm

Rain isn’t harmful to your pool, but it can dilute the balanced chemistry in the water. Unfortunately, this can disrupt pH levels, decrease chlorine and other sanitizers, and increase the growth of algae and other contaminants.

Once the algae spores have the proper conditions to grow, they will accumulate quickly which is why a pool can turn green overnight. A green pool doesn’t look good aesthetically, but most importantly, it can cause health problems for anyone who swims in it.

Excess algae in a pool can cause skin irritation, ear and eye infections, and gastrointestinal illness. To stop your pool from turning green after a rainstorm you should try to prevent dilution before it occurs.

Here are a few ways you can do that:

Watch the weather forecast to balance your pool water before rainfall

Carefully watching the weather forecast can help you prep your pool for a rainstorm. However, investing in a pool cover is even better and can be one of the best tools to avoid a green pool. A quality pool cover is a useful tool to alleviate any mess in the pool water after a storm or rain.

Clean the debris from the pool right away

If you missed the weather forecast and the opportunity to cover your pool it’s important to remove any leaves, twigs or branches that crept into the water. You should also check the pump and skimmer baskets to make sure they aren’t clogged with any debris. Vacuuming the bottom of the pool can also clean up any dirt or dust lingering in the depths of the pool.

Check for accurate water levels

Most pools automatically drain excess water on their own, however, if this isn’t the case for your pool be sure to remove a portion of the water to get your pool back at the proper water level before you start rebalancing the chemicals. Another great tool for balancing water is pHin - a pool and hot tub monitor. This smart monitor device constantly checks the water level and alerts you when there is an imbalance so you don’t have to worry about improper water level after heavy rainfall.

Test your pool water

Once you have the correct amount of water in your pool, you’ll want to check the chemical balance for pH, total alkalinity, and calcium hardness. By checking the chemicals, you can see whether the pool is safe for a swim after rainfall. Heavy rainfall can dilute chemicals and carry particles from the air which will raise or lower the pool’s pH level. Test your pool for the appropriate chemical balance before taking a dip.

For the proper chemical balance, read our blog post about the 7 Essential Chemicals For a Saltwater Pool.

Run your pump and filter the water

Make sure you’ve achieved good circulation and filtration before you give your pool a test swim. To do that, you’ll want to let the system run and give the equipment enough time to verify the water and chemicals are healthy and balanced.

Depending on what type of filter you use, a full circulation could take a few hours or a few days, but don’t get too eager for a dip. Run the pump and filter the water to avoid any green or contaminated water.

Shock your pool

Last but not least, if your pool is still green you may need to shock the pool to make it completely safe for a swim again. Maintaining a higher shock level can kill off all the algae and may take multiple treatments over the course of a few days. In the midst of shocking your pool, try to brush and clean the pool daily to remove dead algae and other dirt.

Rain isn’t harmful to your pool, but the growth of algae can be and if your pool has turned green overnight, we want to help. Contact one of our team members at Pool Service on Demand today and get your pool back to clear and blue water again.


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