Domakihub How to Clean Your Pool After a Storm: A Step-by-Step Guide
Get your pool safe, clear, and swim-ready fast after rain, wind, or a summer storm.
Reviewed by Domakihub pool pros · 2026-06-23 · 5 min read
A summer storm can turn a clean pool into a murky, debris-filled mess in a matter of hours — and in Greece, where sudden Meltemi squalls and heavy August downpours are common, pool owners and holiday rental managers face this problem regularly. The video above walks through the core cleanup process visually; this guide breaks it into clear, ordered steps with extra detail for homes, villas, and hotel pools in the Greek climate. Follow them in sequence and you can typically have the water sparkling again within 24–48 hours.
Why Storms Hit Pools So Hard
Rain and wind introduce a wave of contaminants at once: organic debris (leaves, twigs, insects), dust, soil run-off, and bacteria carried by rainwater. Even a brief but intense storm can dramatically dilute your pool's sanitiser level, swing the pH, and — if the storm coincides with warm temperatures — trigger a rapid algae bloom within 12 to 24 hours. Acting quickly is the single most important thing you can do.
In Greece the problem is compounded by Saharan dust carried by southerly winds (Sirocco/Khamsin), which settles on the water surface and bonds with the upper water layer, making it resistant to simple skimming. Hotel and holiday rental pools face extra pressure because guests expect the water to be ready fast.
Safety and Equipment to Have Ready
Before you touch anything, switch off all electrical pool equipment if the storm is still ongoing or if flooding has reached the equipment pad. Water and electricity around a pump or controller box are a serious hazard. Once conditions are safe, gather your test kit or test strips, a telescoping pole with skimmer net and vacuum head, a pool brush, your chosen shock treatment (calcium hypochlorite or sodium dichloro), algaecide, and a clarifier or flocculant for heavily clouded water.
Most of these products are available at pool supply shops throughout Greece (Praktiker, Leroy Merlin, and specialist pool retailers in Attica, Crete, and the Peloponnese all stock full ranges). Having them on hand before storm season starts saves you the frustration of a closed shop on a Sunday afternoon.
5 Steps to a Clean Pool After a Storm
- 1
Remove Debris Before Running the Pump
Use a leaf skimmer net on a telescoping pole to manually remove all floating debris — leaves, twigs, insects, dirt clumps — from the surface and the pool floor. Do this before switching the pump back on. Running the pump with large debris present clogs the baskets and impeller, which can burn out the motor. Empty and rinse the skimmer basket and pump pre-filter basket too.
- 2
Test the Water Chemistry
Use a multi-parameter test kit or digital meter to measure free chlorine, pH, total alkalinity, and cyanuric acid (stabiliser). Rain dilutes chlorine and often pushes pH upward; Saharan dust events can also spike turbidity and alkalinity. Write down your readings — you need a baseline before you add any chemicals so you do not over-correct.
- 3
Adjust pH and Alkalinity First
Before adding shock, bring your total alkalinity to 80–120 ppm and your pH to 7.2–7.4. Adding shock to water with a high pH makes it far less effective (at pH 8.0, chlorine is roughly 80% less active than at pH 7.2). Use sodium bisulfate or muriatic acid to lower pH; sodium bicarbonate to raise total alkalinity. Allow 30 minutes of circulation between adjustments.
- 4
Shock the Pool
Once chemistry is in range, super-chlorinate the water. For a moderately dirty pool after a storm, a double-dose shock (2× the normal weekly amount) is usually appropriate; for green or heavily contaminated water, go to a triple dose. Add granular shock pre-dissolved in a bucket of water around the perimeter of the pool at dusk — UV light degrades chlorine, so evening dosing gives it overnight to work. Run the pump continuously for at least 8 hours.
- 5
Vacuum, Brush, and Clarify
The following morning, brush the walls and floor thoroughly to dislodge any algae starting to take hold and to push settled sediment into suspension. Vacuum to waste (bypassing the filter) if there is heavy sediment, so you do not clog the filter. Then re-test the water; if it is still cloudy but chemistry is correct, add a clarifier or flocculant to collect fine particles. Run the filter for an additional 24 hours and backwash when the pressure gauge rises 8–10 psi above its clean baseline.
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FAQ
- How long after a storm can we swim again?
- For a mild storm with minor debris, the pool is typically safe once water is clear and chlorine reads 1–3 ppm with pH 7.2–7.6 — often within 24 hours if you act quickly. After a severe storm with heavy contamination or green water, allow 48–72 hours and re-test before anyone enters.
- Should I drain the pool if it overflowed during the storm?
- Only partially. If the water level is more than 10–15 cm above the skimmer mouth, lower it to the mid-skimmer line using the backwash/waste port or a submersible pump — this restores proper skimming action. A full drain is rarely needed and risks popping a fibreglass or vinyl-liner pool out of the ground due to groundwater pressure. Consult a professional before fully draining a below-ground pool.
- The water is green — is it too late to save it without draining?
- In most cases, no. Green water is almost always treatable in place. Triple-shock at dusk, run the filter 24 hours, brush twice daily, and follow up with an algaecide. You may need several rounds of shocking and multiple backwashes over 3–5 days. Drain-and-refill is a last resort and also wastes significant water — a concern in Greece's water-scarce summers.