8 Ways to Remove Wrinkles from Your Inground Vinyl Liner Pool

Wrinkles in an inground vinyl liner pool are usually fixable if the vinyl is still flexible. Start by warming the water so the liner can move, then work the crease toward the nearest wall with your feet, a clean plunger, a soft pool brush, or a wet/dry vacuum placed behind the liner. The best method depends on where the wrinkle is and how severe it looks.

Small floor wrinkles usually respond to foot pressure or a plunger. Large folds may need a partial drain and reset. Wall wrinkles often mean the liner has shifted in the coping track. Warm vinyl moves. Cold vinyl fights you, so work on a sunny afternoon or warm the water first.

Method 1: Push the Wrinkle Out with Your Feet

Foot pressure is the safest first move for wrinkles on the floor or shallow-end slope. Get into the pool with soft water shoes or thick socks, place one foot on the center of the wrinkle, and slowly shuffle toward the closest wall while keeping steady pressure on the vinyl.

Steps:

1. Locate the wrinkle and identify the closest wall or corner.

2. Step onto the center of the wrinkle with one foot.

3. Slide your foot outward toward the wall in one continuous motion, pressing down.

4. Repeat from different angles until the liner lies flat.

Do not use this method in the deep end or anywhere you cannot stand safely.

Method 2: Jump on the Wrinkle While the Pool Is Refilling

The jumping method only works during a fresh refill, when the rising water adds pressure and helps your heel impact move the liner. Stand with your back against the pool wall above the wrinkle, lift both feet, and drop your heels onto the vinyl. The combined force helps spread the liner back against the floor.

Steps:

1. Begin refilling the pool until water reaches roughly knee height over the wrinkle.

2. Position yourself with your back against the wall, directly above the wrinkle.

3. Lift both feet and drop your heels firmly onto the wrinkle.

4. Repeat 4 to 6 times, shifting position slightly each jump.

Stop once the water rises past hip height. At that point, the water absorbs too much of the impact and the method stops doing much.

Method 3: Use a Toilet Plunger on Stubborn Wrinkles

A new, clean toilet plunger is the best DIY tool for wrinkles your feet cannot move. The plunger creates suction on the liner and lifts it just enough to release trapped water or air, letting the vinyl settle back flat.

Use a fresh rubber plunger that has never been used in a bathroom. Then follow these steps:

1. Submerge the plunger and place the cup flat over the wrinkle.

2. Push down to create suction.

3. Pull upward gently while dragging toward the nearest wall.

4. Release the suction at the wall and repeat if the wrinkle is long.

For deep-end wrinkles, attach the plunger to a telescopic pool pole, or use a snorkel and mask if you can reach the spot safely.

Method 4: Roll Wrinkles Flat with a Soft Pool Brush

A soft-bristled nylon pool brush works well for shallow, surface-level wrinkles, especially on walls and slopes where a plunger cannot seal properly. The brush lets you roll the vinyl in the direction you want it to move without scratching the liner.

Steps:

1. Attach a soft-bristled nylon brush to your telescopic pole. Do not use stainless steel bristles.

2. Place the brush flat against the wrinkle.

3. Push the brush in one direction, toward the nearest wall or corner.

4. Repeat in long, even strokes until the wrinkle flattens.

If the wrinkle will not move with the brush, switch to the plunger. A stiffer brush will not work better here, and it can tear older vinyl.

Method 5: Warm the Water Before Trying Again

Cold vinyl does not stretch easily. Before you keep fighting the wrinkle, warm the water over that area to roughly 80°F to 90°F with a pool heater, a solar cover, or several buckets of warm tap water poured directly over the crease.

Steps:

1. Check current water temperature. Vinyl below 70°F resists stretching.

2. Run a pool heater or solar cover for 4 to 6 hours, or pour 5 to 10 gallons of warm tap water (no hotter than 100°F) directly on the wrinkle.

3. Wait 10 minutes for the vinyl to soften.

4. Retry foot pressure or the plunger on the now-pliable liner.

Do not use boiling water. Water above 140°F can permanently damage vinyl, so leave the kettle out of this job.

Method 6: Drain Partially and Reset the Liner

A partial drain is the most reliable fix for large folded wrinkles that will not respond to surface methods. It gives you enough access to physically reset the liner, but it takes several hours and needs to be done carefully.

Steps:

1. Drain the pool until only 4 to 6 inches of water remain in the shallow end. Never drain a vinyl liner pool completely.

2. Walk the wrinkles out by foot, working from the deep end toward the shallow end.

3. Use a plunger on any wrinkle your feet cannot move.

4. Begin refilling while the liner is still warm and pliable.

5. Once water reaches the wrinkle area, do a final foot pass to lock the liner in place.

Move quickly once the water is low. An exposed liner can shrink and dry within hours in direct sun, and a fully dried liner often cannot be seated correctly again.

Method 7: Vacuum Air Out from Behind the Liner

When air or groundwater gets behind the liner, often after heavy rain or a partial drain, a wet/dry shop vacuum can pull the vinyl tight against the wall and floor again. This method works best when paired with a partial drain.

Steps:

1. Drain the pool to roughly half full.

2. Feed a shop vacuum hose between the top of the liner and the coping track.

3. Seal around the hose with a wet towel to maintain suction.

4. Run the vacuum. The liner will visibly tighten against the walls and floor within minutes.

5. While the vacuum is still running, begin refilling the pool.

6. Pull the hose out just before the water reaches the coping.

If the liner wrinkles again within a few days, the problem is probably active groundwater pressure. That calls for professional drainage work, not another quick reset.

Method 8: Reseat the Liner in Its Coping Track

Wrinkles high on the wall, just below the coping, often mean the liner bead has slipped or twisted in the track. Once you find the shifted section, the fix is usually quick.

Steps:

1. Locate the sagging or wrinkled section on the upper wall.

2. Gently pull the top bead of the liner out of the coping track using your fingers.

3. Twist or shift the liner horizontally so the wrinkle straightens.

4. Press the bead back into the track using a dull tool like a plastic paint stirrer or the back of a butter knife.

5. Run your hand along the track to confirm the bead is seated evenly.

Never use a screwdriver, scissors, or any sharp-edged metal tool. One nick near the bead can turn into a larger failure along the wall.

What Causes Wrinkles in a Vinyl Liner Pool

Vinyl liner wrinkles happen when the liner stretches, shrinks, or shifts away from the pool wall or floor. The three most common causes are low pH water that softens and expands the vinyl, groundwater pushing behind the liner after heavy rain, and dropping the water level below the recommended fill line.

Low pH affects the vinyl itself. When pH stays below 7.0 for too long, the vinyl can absorb water and expand. The pool structure does not expand with it, so the extra surface area bunches into wrinkles.

Groundwater causes a different kind of wrinkle. After heavy rain, the water table can rise and push the liner upward from underneath, sometimes floating the liner several inches off the floor. Draining creates wrinkles by removing the water pressure that holds the liner flat. When the pool refills, the liner may not return to its original position.

A chemistry-related wrinkle usually responds to heat and a plunger. A groundwater wrinkle needs the trapped air or water behind the liner removed first. A draining-related wrinkle often needs a partial reset.

How to Prevent Vinyl Liner Wrinkles in the Future

The best prevention is simple and consistent: keep pH between 7.4 and 7.6, keep calcium hardness between 200 and 400 ppm, and do not let the water level stay below the skimmer for more than a few hours. Pool owners who stay on top of those three habits rarely deal with serious liner wrinkling.

Steps to keep your liner wrinkle-free:

1. Test water chemistry weekly during swim season.

2. Correct low pH within 24 hours using soda ash or pH increaser.

3. Check for leaks if water level drops more than a quarter inch per day.

4. Remove heavy debris before it settles long enough to stretch the vinyl.

5. Brush the pool weekly to keep the liner moving slightly against the walls.

Heavy debris is the prevention step many owners miss. Wet leaves, sand, and algae mats that sit on the same section of vinyl for weeks act like a localized weight. Over time, that weight can stretch the liner out of shape. Add a mild pH swing, and that same spot becomes the first place a wrinkle forms.

A cordless robotic pool cleaner rated for vinyl can handle that prevention work consistently, but the right setup depends on the debris problem.

For everyday prevention, the goal is to stop debris before it reaches the liner. The Beatbot AquaSense 2 Pro robotic pool cleaner is designed around that sequence. Its 5-in-1 cycle includes water-surface cleaning, so floating leaves are removed before they sink.

Its ClearWater™ Clarification System dispenses an included natural clarifier that binds fine particles, including pollen and dead algae, into clumps the filter can capture during the same cleaning run. Fewer loose particles reach the liner in the first place.

During fall leaf drop or post-storm cleanup, the bigger issue is capacity and reach. A small debris basket can fill mid-cycle, the robot stops, and leaves keep settling onto the vinyl.

The Beatbot Sora 70 cordless robotic pool cleaner is built for that heavier load, with a 6L debris basket roughly two to three times the capacity of standard cleaners, JetPulse™ surface technology that draws floating leaves and pollen into the suction inlet before they sink, and shallow-water cleaning down to 8 inches for platform corners where debris tends to collect against the liner.

FAQs

Are vinyl pool wrinkles a sign of a damaged liner

Not usually. Most wrinkles come from water chemistry, groundwater, or improper draining while the liner itself remains intact. The liner is damaged only when you see tears, seam cracks, or visible thinning in high-friction areas such as steps.

Can you swim in a pool with wrinkles in the liner

Yes. Minor wrinkles are more of a cosmetic and lifespan issue than a safety issue. Swimming is usually fine, but large wrinkles or floating sections of liner should be fixed quickly because they can turn into tears over time.

How long does it take for wrinkles to set permanently in a vinyl liner

Wrinkles caused by low pH or draining can become semi-permanent after about 6 to 12 months if they are ignored. The vinyl loses elasticity along the crease lines. Fresh wrinkles caught within a few weeks are almost always reversible.

What if the wrinkles come back after I fix them

Wrinkles that come back usually mean the root cause is still there, most often low pH, a slow leak, or groundwater pressure behind the liner. Retest your water chemistry first, check for water loss over 48 hours, and call a pool technician if both look normal.