How to Manage Your Swimming Pool When it Rains 

A close up of a managed swimming pool.

Rain is known for being nourishing to plants, grass and flowers. But it can also harm the water quality of your fibreglass pool. This is why during the rainy season, you’ll need to maintain your pool water. When there are heavy rains, this can cause potential flooding of your pool as well. The rain can also drag debris as well as muddy water into your pool.

Ideally, you can consider proactively protecting your pool before the onset of rain. You may also need to deal with your pool after a sudden storm. When you maintain the water in your pool regularly, you ensure that your pool is safe for people to swim in. Not only will you be improving the water quality, but you’ll also be protecting your pool equipment.

What rain does to the water in your pool

A short spell of rain won’t affect your fibreglass pool in any major way. However, should a big storm be on the way, then this could be a problem. If the rainfall exceeds 1 to 2 inches every hour, then this could affect the quality of water in your pool. It could also affect your pool equipment and pool surfaces.

Rainwater tends to be rich in nitrogen and is also acidic. The pH levels of your pool can be lowered, which then negatively affects the water chemistry. Pool water that is acidic can be irritating to both the eyes and the skin. But what’s more dangerous is that your pool disinfection and sanitation can be rendered ineffective. This means that your pool will no longer be protected against bacteria and other foreign contaminants.

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What’s even more problematic about heavy rain is that the nitrogen-rich and acidic water also creates the perfect breeding ground for algae. If you don’t suddenly want to see the water in your fibreglass pool turn green due to algae, then you’ll need to take preventative action.

How can you maintain your pool before it rains?

Anytime the weather forecast for your area predicts that heavy rainfall is on the way, you’ll need to proactively care for your pool. This way, you can ensure that the water in your pool is clean as well as healthy. Before it rains, you should:

– Ensure that the pH level and alkalinity of your newcastle pool are balanced. This will help to maintain your water chemistry through the rain.

– You may need to shock the water in your pool. The level of chlorine in your fibreglass pool should be raised by around 1 to 2 ppm higher than the recommended levels.

– Consider using an algaecide to prevent a potential algae infestation after the rain. If you want to keep the surfaces of your fibreglass pool clean, then you’ll need to prevent algae from entering your pool.

– The surfaces of your pool should be brushed. You’ll need to brush the walls and the floor of your pool on a regular basis. This will help you keep small particles of algae at bay, and ensure that they circulate into your pool filter.

– Remember to follow the cleaning schedule for your filter carefully. Follow the instructions from the manufacturer, to clean your pool filter.

Fibreglass Pool Maintenance

Caring for your pool after it rains

If you want to keep the water in your pool clean, then you’ll need to be proactive about your pool maintenance. It’s possible that you have a busy schedule, or that a sudden storm catches you off guard. In such cases, you may not have enough time to maintain your pool proactively. If this happens, then don’t worry there are still things that you can do to your pool after it storms. You can care for your fibreglass pool after it rains in the following ways:

– If there’s an excessive run-off of water, then this could lead to mulch, dirt, debris, and even grass making their way into your pool. This is why you should use either a leaf rake or your skimmer net to get rid of large debris from the water in your pool.

– If there’s any fine debris in your pool, then this will also need to be removed. You can use a roller with a vacuum head for this purpose.

– In case you notice an algae bloom, you’ll need to use an algaecide to get rid of it. You’ll also need to brush the steps, floors, walls, and other surfaces of your pool.

– You should also make sure that your skimmer baskets as well as the line basket, aren’t clogged due to debris. Your pool pump should also be working normally. This will help the algaecide you’ve added to your pool water to get rid of the algae before it grows.

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– The levels of disinfectant in your pool will need to be maintained. You’ll also need to balance the water chemistry of your pool.

– Do a test to measure the pH and total alkalinity levels of your pool.

– Use chlorine shock to super chlorinate the water in the pool. This will also kill any algae that may be present in the pool water.

– You’ll need to ensure that proper filtration is maintained. When you have a filtration system that works well, it can trap algae or debris that might be circulating in your pool water.

– Make use of phosphate removers should soil and mulch get into your pool after it rains. You can make use of phosphate removers through the rainy season, as it’s a good way to prevent your pool from being contaminated by substances like mulch.

If you find that you need further assistance to deal with your pool after it rains, then you should get in touch with a pool service provider.


There are several things that you can do to care for your pool both before and after it rains. When you take preventative action to protect your pool before it rains, you ensure that the water health of your fibreglass pool is maintained. But even if you can’t take preventative action to protect your pool, there are still several things that you can do to care for your pool. Use this guide to learn how you can maintain your fibreglass pool both before and after it rains.

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