Why is my pool liner wrinkling?
Vinyl liners wrinkle for a handful of reasons: water chemistry out of balance, a liner that was stretched or shrunk by draining or by cold, a poor fit from the original installation, or a base that has shifted. Check your water balance and level first, never drain the pool to smooth it out, and take stubborn wrinkles to the liner's seller.
Free to ask. Local shops send quotes, and you pay only when you book one.
By Kasra Taheri, Founder, LoclisPublished
Researched and drafted with AI, then checked claim by claim against the sources listed below before it was published. Prices and rules change; the dates beside each source say when it was last checked.
Step by step
Read when to stop and call a pro, further down this page, before you start.
Step 1: Note where the wrinkles are
Look at whether they run along one wall, around the whole pool, or only at the floor, since a pattern points to a cause.
Step 2: Keep the water at its normal level
Do not drain the pool, and if it has dropped, top it up, since draining can stress and shrink the liner.[1]
Step 3: Test the water balance
Test the water and correct anything out of range with your pool store's advice, because imbalance is one of the causes manufacturers name for wrinkling.[1]
Step 4: Dissolve chemicals before adding them
Dissolve chlorine or shock first and do not let concentrated chemicals sit on the liner.[1]
Step 5: Check for a pattern at the wall base
Look at the base of the wall and the cove for sagging, a gap or a soft spot, which suggest the pool has shifted.
Step 6: Photograph the wrinkles and find your paperwork
Take dated photos and find the receipt and warranty for the liner.
Step 7: Contact the seller or installer
Ask the retailer or installer to look at the fit before you try to pull the liner by hand.
Wrinkles in a vinyl liner commonly come from one of four things: water chemistry that has been out of balance, a liner that shrank or shifted after the water level dropped, a fit that was never quite right at installation, or a pool base that has moved. Start with the water, leave the pool full, and hand stubborn wrinkles to the person who sold or fitted the liner.
The common causes
Water chemistry. Manufacturers say plainly that balance matters: "Maintain proper water balance to prevent wrinkling, scaling, bleaching, and premature aging."[1] Chemicals that sit undissolved on the vinyl do harm too, so "Always dissolve chlorine/shock before adding - do not allow concentrated chemicals to sit on the liner."[1]
Low water or draining. Water weight holds a liner in place. Swimline warns that "Draining can stress and shrink the liner and may void warranty."[1] Its warranty page explains why: "Removing the water eliminates the pressure that keeps the liner properly positioned, which can cause shifting, shrinkage, or stress on the material and seams."[2] Even during installation, the warning is "Do not stop filling or leave the pool without water overnight. Vinyl can shrink - and this may void warranty."[1]
Cold at installation. Cold vinyl is stiff and shrinks, so a liner installed in a cold snap may never lie flat. The advice is to "Install at 65°F+ whenever possible (vinyl shrinks/stiffens below 65°F)."[1]
Fit and base. If a liner does not fit well, Swimline's checklist asks about the base, the level and the alignment. It also asks "Has the pool shifted or been altered?" and expects a base of "2 inches of fine sand/foam + a proper 4-6 inch cove".[1] A soft spot, a slumped wall or an uneven cove produces wrinkles that no chemistry fix will remove.
Read the pattern
Wrinkles around the whole waterline after a low-water spell may point to a liner that has moved. Wrinkles at one wall or one corner may point to a base or fit problem in that spot. Soft wrinkles across the floor are often cosmetic, but a seller or installer can tell you for certain.
What you can do
Work through the steps above in order. Top up to the normal level, test the water, fix what is out of range, and dissolve chemicals before they go in. Do not expect the warranty to cover it: Swimline's terms say "Coverage applies only to seam separation resulting from manufacturing defects" and exclude "Damage caused by misuse, negligence, or improper installation".[2] Do not walk on the wrinkles to flatten them or pull the liner out of its track, since stretching vinyl by hand can tear it or leave a worse fit.
If the pool is covered in season, chlorine vapor under the cover matters as well. Latham's warranty says covered pools "should be safely uncovered once a day to release excessive chlorine vapor" and that "Excessive chlorine vapor will cause premature liner failure."[3]
Stop and call a pro if
- The wrinkles are sharp, whitened or cracking. Stressed vinyl can split. See how to patch a vinyl pool liner for small damage, and whether to patch or replace if the liner is failing.
- A wall is bowing, sagging or has a gap at its base. That is a structural and installation problem, not a liner problem.
- The pool is losing water. A falling level lets the liner shift. Try the bucket test first, then have the leak found.
- The liner needs to be reset. Resetting or re-hanging a liner means lowering the water and handling the track, which is why draining it yourself risks your warranty. Contact the seller or installer first.
- You are weighing a new liner. Costs and timing are in how much a new vinyl liner costs in Virginia.
Next steps in Virginia
Browse more pool equipment answers, or find local help in pool equipment repair. When you want someone to look at the fit, describe the problem and Virginia pool pros can quote it.
Common questions
- Can I drain the pool to smooth out the wrinkles?
- Generally no. Swimline's guidance is that "Draining can stress and shrink the liner and may void warranty."[^swimline-faq] Its warranty page adds that "Removing the water eliminates the pressure that keeps the liner properly positioned, which can cause shifting, shrinkage, or stress on the material and seams."[^swimline-warranty] If the liner has to be reset, that is a job for whoever installed it.
- Will the wrinkles go away by themselves?
- Sometimes, if they came from a low water level, because the water's weight can settle the liner as the pool fills. Wrinkles from a poor fit or a shifted base usually stay or get worse.
- Do wrinkles mean the liner is ruined?
- Not necessarily. Small, soft wrinkles are often cosmetic. Sharp creases, wrinkles that catch on feet or the vacuum, or creases that are whitening or cracking are worth a closer look, because stressed vinyl can eventually split.
- Is wrinkling covered by the liner warranty?
- Usually not. Swimline's warranty states that "Coverage applies only to seam separation resulting from manufacturing defects" and excludes "Damage caused by misuse, negligence, or improper installation".[^swimline-warranty] Read your own warranty and ask the seller.
- Can cold weather cause wrinkles?
- Cold stiffens vinyl and makes it shrink, which is why Swimline advises installing a liner at "65°F+ whenever possible".[^swimline-faq] A liner installed in cold weather or left without enough water can end up with a poor fit.
Sources
- [1] Swimline Frequently Asked Questions (liner care and installation), Swimline. Checked October 28, 2026.
- [2] Pool Liner Warranty, Swimline. Checked October 28, 2026.
- [3] 20 Year Limited Vinyl Liner Warranty, Latham Pool Products. Checked October 28, 2026.
Want a pro to handle it?
Describe the job once. Licensed local businesses send quotes, and you pay only when you book one.
Get a quote for Pool Equipment