Florida pools and storms are an unavoidable combination. From spring thunderstorms to hurricane season, Tampa Bay pool owners deal with significant rain events regularly — and each one has the potential to destabilize water chemistry, introduce organic contaminants, and leave debris that feeds algae if not addressed promptly. The good news: with the right recovery sequence, most pools can be restored to normal condition within 24–48 hours of a storm.
Right after the storm: physical cleanup first
Before touching the chemistry, do the physical cleanup:
- Remove large debris from the surface and floor — leaves, twigs, anything blown in. Use a leaf rake net rather than a standard skimmer net for large debris loads. If you vacuum now before clearing debris, you'll clog your filter quickly.
- Empty skimmer and pump baskets. Storm debris fills these fast. A clogged basket restricts flow to the pump — check them even if you checked them before the storm.
- Check the water level. Heavy rain can overflow the pool above the skimmer opening. If the water level is above mid-skimmer, the surface skimming action is lost. Use the drain/waste setting on a multiport valve or a submersible pump to lower it back to the correct level (mid-skimmer opening).
Test the water before adding anything
Heavy rain does two things to pool chemistry: it dilutes everything (lowering chlorine, alkalinity, and all other parameters proportionally) and it lowers pH directly (rainwater is naturally acidic, typically pH 5.5–6.0). Test for free chlorine, pH, alkalinity, and if possible phosphates before adding any chemicals.
Don't assume the chemistry is off and start adding chemicals blindly — if rain was brief and the pool is screened, the impact may be minimal. Test first, then treat what actually needs treating.
Chemistry recovery sequence
After testing, address chemistry in this order:
- Adjust alkalinity first (target 80–120 ppm) using sodium bicarbonate if it's low. Alkalinity is the buffer that stabilizes pH — getting it right first makes the pH adjustment hold.
- Adjust pH to 7.2–7.4 using pH increaser (soda ash) if it's dropped below range. After storms, pH is almost always low.
- Shock the pool. Even if chlorine tests show adequate levels, shocking after a storm is good practice — rain introduces bacteria, organic compounds, and contaminants that increase chlorine demand. Use calcium hypochlorite shock in the evening, targeting 10 ppm free chlorine.
- Add phosphate remover if phosphates are elevated. Storm runoff and organic debris are major phosphate sources. If levels test above 200 ppb, treat before algae has a chance to establish.
Run the filter continuously
After a storm, run your pump and filter 24 hours a day until the water is completely clear and chemistry is stable. Check the filter pressure frequently — the debris load from a storm will clog filter media faster than normal operation. Backwash or clean the filter as needed rather than letting it run at high pressure.
Hurricane preparation and recovery
For major hurricanes and tropical storms, the pre-storm and post-storm protocols are more extensive:
Before the storm: Shock the pool to establish a high free chlorine reserve (10–15 ppm). Do not drain the pool — a full pool is structurally important, particularly for in-ground pools that can pop out of the ground if drained and the water table rises. Remove all pool equipment, toys, and deck furniture that could become projectiles. Lower the water level slightly (4–6 inches) to allow for rain accumulation, but don't go below the skimmer.
After the storm: Wait until conditions are safe before assessing the pool. Remove all debris before running equipment — storm debris can contain materials that damage pumps and impellers. Check all equipment for physical damage before turning anything on. Test chemistry and follow the standard recovery sequence, but expect to use significantly more chemicals after a major storm. Contaminant load from flooding can be severe — if your pool flooded with yard runoff, the remediation may require multiple shock treatments over several days.
Signs that professional help is needed
Call your service company if: the pool is still cloudy 48 hours after treatment, the water has an unusual color (brown or black from tannins or contamination), you're seeing equipment damage, or the pool flooded with runoff from outside the yard. Post-hurricane remediation in particular often requires a professional assessment before the pool is safe to swim in again.