Protect Your Pools Structure with a DIY Pool Liner Inspection

7 Practical Tips for Inspecting Your Pool Liner Yourself

Pool liner inspections are important, since pool liners are constantly exposed to sun, chemicals, and changing temperatures. Over time, this can cause the liner to fade, wrinkle, weaken, or tear. Regular inspections will help; prevent leaks and water loss, extend the life of your pool liner, protect the pool walls and floor, reduce the risk of costly repairs and keep your pool looking clean and well-maintained. Use these 7 DIY tips to perform your own comprehensive pool liner inspection.

Tip #1: Check the Water Level With the Bucket Test

One of the first signs of a pool liner problem is unexplained water loss. While some water loss is normal due to evaporation, losing more than about 1/4 inch of water per day could indicate a leak in the liner. An easy way to test this is the bucket test:

1. Fill a bucket with pool water.
2. Place the bucket on a pool step.
3. Mark the water level inside the bucket and the pool water level outside the bucket.
4. Wait 24 hours and compare the levels.

If the pool water level drops more than the bucket water level, you may have a leak.

Tip #2: Look for Wrinkles and Stretching

Small wrinkles may not be urgent, but large wrinkles can become weak spots that eventually tear. Walk around your pool and look carefully at the liner surface. Wrinkles can form from:

• Groundwater pressure
• Improper installation
• Age of the liner
• Water chemistry issues

Tip #3: Inspect Seams and Corners

Liner seams are one of the most common areas for leaks to start. If you notice separation, lifting, or small gaps at the seams, it may need professional repair. Pay close attention to:

• Corners of the pool
• Steps and ladders
• Around skimmers and return jets
• Seams along the walls and floor

Tip #4: Look for Fading and Brittle Areas

Sun exposure and chemicals can cause liners to fade and become brittle over time. If you notice any of these signs, the liner may be nearing the end of its lifespan:

• Areas that feel rough or brittle
• Significant fading
• Cracking when the liner is pressed
• Chalky residue

Tip #5: Feel for Soft Spots Behind the Liner

If possible, gently press on the pool walls in different areas. If you feel soft spots or areas that move inward, water may be getting behind the liner, which can lead to wall damage over time. 

Tip #6: Use Food Coloring to Find Leaks

This works especially well around fittings and seams. If you suspect a leak but cannot find it, use food coloring:

• Turn off the pool pump
• Hold a small amount of food coloring near a suspected tear or seam
• If the coloring gets pulled into the liner, you have likely found a leak

Tip #7: Check Around Pool Fittings

Make sure the liner is tight and the gaskets are not cracked or leaking. Inspect the liner around:

• Skimmer
• Return lines
• Pool lights
• Main drain
• Steps

How Often Should You Inspect Your Pool Liner?

You should perform a visual pool liner inspection at least once per month and a more detailed inspection at the beginning and end of each pool season.