How to Fix a Pool Leak?Updated a month ago
A leaking pool can waste thousands of litres of water and damage equipment or surrounding structures. Here’s how to find and fix common leaks in pools—no pro required (for most cases).
Step 1: Confirm It’s a Leak (Not Evaporation)
Bucket test:
Fill a bucket with pool water and place it on the steps (submerged halfway).
Mark water levels inside the bucket and on the pool wall.
Check after 24 hours.
Same loss: Evaporation.
Pool loses more: Likely a leak.
Step 2: Locate the Leak
Common leak points:
Skimmer: Cracks around the throat or loose seals.
Return jets: Loose fittings or cracked plastic.
Pool liner (vinyl): Tears or punctures (check for wrinkles or sagging).
Lights/conduits: Faulty seals around niches.
Plumbing lines: Wet soil near pipes, air in the pump.
Leak detection methods:
Dye test: Squirt leak detection dye near suspected areas. If the dye is sucked out, you’ve found the leak.
Listen: Hissing sounds near equipment indicate suction-side leaks.
Step 3: Fix Common Leaks
Skimmer or Return Jet Leaks
Epoxy putty: Apply underwater epoxy to cracks or gaps (e.g., Pool Putty, CORKIT, Aqua Fix-it).
Silicone sealant: Re-seal around fittings (let cure 24 hours before refilling).
Vinyl Liner Tears
Patch kit: Cut a patch 5cm larger than the tear, apply adhesive, and press firmly (use a vinyl repair kit for best results).
Temporary fix: Waterproof tape (e.g., Flex Tape) until a proper patch is applied.
Plumbing Leaks
Pipe sealant: Use PVC glue or threaded seal tape on joints.
Underground leaks: For tiny leaks, try a leak sealer. If that doesn't work, call a pro—requires pressure testing or excavation.
Equipment Leaks
Pump seals: Replace worn shaft seals or O-rings.
Filter leaks: Tighten clamps or replace filter tank O-rings.
Step 4: Prevent Future Leaks
Inspect seals and fittings annually.
Avoid over-tightening connections (cracks plastic).
Winterise pipes in frost-prone areas (e.g., drain pumps).
Trim roots near underground plumbing.
When to Call a Pro
Structural cracks in concrete/fibreglass.
Persistent underground leaks.
Electrical issues (e.g., pool light leaks).
Final Tip: Fix leaks early to save water, money, and headaches.