How to Fix Cloudy Pool Water After a Storm

A heavy rainstorm can do more than just fill your pool — it can leave your water looking cloudy, dirty, or even unsafe to swim in. If you’ve walked outside after a storm to find your pool looking more like a pond, don’t panic. Fixing cloudy pool water after rain is easier than you think, and it doesn’t require a full water change.

In this guide, we’ll walk you through the steps to restore clear water fast, and how to stop it from happening next time.

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Why Storms Make Pool Water Cloudy

When it rains, your pool is exposed to:

• Debris (leaves, dirt, grass, dust)

• Diluted chemicals (from excess water)

• Runoff (from nearby garden beds or pavers)

• Algae spores carried by wind and rain

All of this throws off your water balance. Chlorine levels drop, pH and alkalinity shift, and organic matter feeds bacteria or algae. The result? Cloudy or milky water, even if the pool looked perfect before the storm.

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Step 1: Remove Debris Quickly

Start by skimming the surface and vacuuming the bottom of your pool. Remove:

• Leaves and branches

• Grass clippings

• Insects

• Any floating debris

The sooner you do this, the better. Organic debris can cause chemical imbalance, clog filters, and promote algae growth. Use a leaf net and manual vacuum for best results.

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Step 2: Check and Adjust Water Level

Heavy rain can overfill your pool. If water is touching the coping or overflowing, lower it to the correct level (about halfway up the skimmer box opening).

You can do this by:

• Backwashing (for sand filters)

• Draining to waste (if your system allows it)

• Using a submersible pump or siphon

Maintaining the right level helps the skimmer work properly and improves circulation.

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Step 3: Test Your Water

Use test strips or a liquid test kit to check:

• Free chlorine

• pH level

• Total alkalinity

• Cyanuric acid (stabiliser)

• Calcium hardness (if relevant)

Rainwater is usually acidic and dilutes sanitiser, so your pH may be low and chlorine levels near zero.

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Step 4: Balance the Chemicals

Based on your test results:

• Raise chlorine if it’s low (add liquid chlorine or shock)

• Adjust pH to 7.2–7.6 (using soda ash or pH decreaser)

• Correct total alkalinity to 80–120 ppm

• Re-stabilise cyanuric acid if it dropped below 30 ppm

You’ll find all the balancing agents and test kits you need in our full range of pool products.

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Step 5: Shock the Pool

Even if chlorine isn’t zero, a heavy shock helps kill bacteria and break down any contaminants.

Use a granular or liquid pool shock:

• Run the pump for at least 8 hours

• Leave the pool uncovered

• Avoid swimming until chlorine returns to safe levels (1–3 ppm)

Cloudy water after rain usually clears up faster after a proper shock treatment.

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Step 6: Run the Filter Non-Stop

Let your pool pump and filter run for at least 24 hours. This helps trap fine particles and restores circulation.

• Backwash sand or DE filters after a few hours

• Rinse cartridge filters if pressure rises

If your filter isn’t working well, it might be time for a clean or replacement. We stock quality filter media and replacements in our pool products collection.

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Step 7: Use a Clarifier or Flocculant

Still cloudy after 24 hours? Add a clarifier to bind tiny particles into clumps your filter can catch.

If your pool is really milky:

• Use a flocculant (also called a “floc”)

• Let particles settle overnight

• Vacuum the pool floor to waste (don’t filter)

These products give your water that final polish and speed up clarity.

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Step 8: Brush and Clean Pool Surfaces

Use a pool brush on:

• Pool walls

• Steps and swim-outs

• Behind ladders and around drains

This dislodges algae or dirt that might be feeding bacteria and helps sanitiser reach everywhere.

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Step 9: Retest and Adjust as Needed

After 1–2 days, retest your pool. Adjust chlorine or pH if needed. If the water’s still cloudy, repeat the shock or clarifier process. Sometimes it takes a few days to fully recover — but consistent filtering and balancing will always get you there.

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Step 10: Prevent Future Cloudy Water

To reduce the chance of cloudy water after the next storm:

• Use a pool cover during heavy rain

• Keep chemicals balanced (check weekly)

• Cut back overhanging trees

• Check filter pressure and backwash regularly

• Clean skimmer baskets often

Keeping the water balanced and clear helps your pool resist storm impact and bounce back quicker when bad weather hits.

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Conclusion

Cloudy water after a storm is annoying — but totally fixable. With quick cleanup, water testing, chemical balancing and a strong filtration run, your pool will be sparkling again in no time.

Want to make sure you’re ready for the next downpour? Explore our wide range of pool products — from clarifiers and test kits to pumps, filters and cleaning tools. A few smart supplies can save you hours of work and keep your pool ready to dive in year-round.

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Frequently Asked Questions