The basic process: drain, remove the old liner, and install the new one

Replacing an above-ground pool liner takes a full day and requires draining the pool completely. You will need a submersible pump or a siphon to empty the water, a utility knife, a liner installation kit (which includes a coping strip and overlap hardware), and the new liner itself. Most homeowners can do this alone, though a second person makes the job faster and safer.

The work breaks into three main stages: draining and preparing the pool, removing the old liner, and installing the new one. Each stage has specific timing and common mistakes that can damage your pool walls or make the new liner wrinkle. The entire job typically takes 8 to 12 hours spread across one or two days.

Key Takeaways

  • Drain the pool completely using a submersible pump or siphon before you touch the old liner, and let the pool walls dry for at least a few hours.
  • Remove the old liner by cutting it into strips with a utility knife, starting at the top and working downward to avoid trapping air underneath.
  • Inspect and repair the pool walls, floor, and coping track before installing the new liner, because damage will show through or cause leaks.
  • Install the new liner by centering it, anchoring the top edge, and then smoothing it downward in sections to avoid wrinkles and folds.
  • Fill the pool slowly while continuing to smooth the liner, because water weight helps it conform to the pool shape but can trap air if you rush.

Draining the pool and preparing the walls

Turn off the pump and filter system first. If your pool has a drain plug at the bottom, open it and let gravity do the work—this is the slowest method but requires no equipment. For faster draining, use a submersible pump placed at the lowest point of the pool floor and run the discharge hose away from the pool and away from your house foundation. A typical 15,000-gallon above-ground pool takes 4 to 8 hours to drain with a pump rated for 2,000 to 3,000 gallons per hour.

Once the pool is empty, let the walls and floor dry for at least 2 to 4 hours on a sunny day, or overnight if it is cloudy. Wet walls make the old liner stick and the new one slip. While you wait, inspect the pool structure. Look for cracks in the walls, rust spots on metal walls, sharp edges on the coping track (the channel that holds the liner at the top), and debris on the floor. Remove any rocks, sticks, or sharp objects by hand. If you find cracks or rust, you may need to patch or seal them before the new liner goes in—consult your pool manufacturer's repair instructions for the specific product.

Removing the old liner safely

Start at the top of the pool. Use a utility knife to cut the old liner away from the coping track, working your way around the entire perimeter. Cut the liner into vertical strips about 2 to 3 feet wide as you go, rather than trying to remove it in one piece. This prevents the liner from folding back on itself and trapping air, which can damage the pool walls underneath.

As you cut each strip, pull it away from the wall and fold it toward the center of the pool. Work downward in sections—cut and remove the top third, then the middle third, then the bottom. Once the liner is completely removed, sweep the floor and walls with a soft broom to remove any dirt, sand, or algae. Check the coping track for debris and wipe it clean with a damp cloth. If the track is bent or damaged, straighten it gently with a rubber mallet before you install the new liner.

Inspecting and repairing the pool structure

Walk the perimeter of the pool and run your hand along the coping track to feel for sharp edges, dents, or rust. Sand down any rough spots with medium-grit sandpaper (80 to 120 grit) and wipe away the dust. If you find rust on a metal wall, use a wire brush to remove the loose rust and then explore a rust converter product according to the manufacturer's instructions.

Examine the pool floor and walls for cracks, punctures, or areas where the concrete or metal is visibly damaged. Small cracks (less than 1/8 inch wide) can often be left alone, but larger ones should be sealed with a pool-grade concrete patching compound or metal repair tape, depending on your pool material. Let any repairs cure fully before you proceed—this usually takes 24 hours. If you are unsure whether a crack is safe to leave, contact the pool manufacturer or a pool service technician.

Installing the new liner: centering and anchoring

Lay the new liner flat on the pool floor, still folded or rolled as it came from the manufacturer. Unfold it carefully and center it so that the overlap (the extra material that folds over the coping track) is even on all sides. This usually means the liner should be roughly centered in the pool, with equal amounts of material on each side.

Once centered, anchor the top edge of the liner to the coping track at four points: the center of each side of the pool. Use the coping strips and overlap hardware that came with your liner kit. These hold the liner in place while you smooth it down. Do not fully tighten the hardware yet—just snug it enough to keep the liner from shifting. The liner should still be loose and wrinkled at this stage.

Smoothing the liner and filling the pool

Starting from the anchored points, smooth the liner downward and outward toward the corners and sides. Use your hands and feet to work out large wrinkles and folds as you go. Work in sections: smooth from the top center toward one corner, then the next corner, then the sides. The goal is to remove major wrinkles before you add water, because water weight will help the liner conform to the pool shape, but it will also lock in any folds you leave behind.

Once the liner is reasonably smooth, begin filling the pool slowly with a garden hose. As the water level rises, continue smoothing the liner. Start at the top and work downward, pushing wrinkles toward the edges and corners. The water weight will help the liner settle into the pool shape, but you need to guide it. Fill to about 6 inches, smooth again, then fill to 12 inches, smooth again. Continue this process until the pool is full. This takes longer than straightforward turning on the hose and walking away, but it prevents wrinkles and folds that will be permanent once the pool is full.

Once the pool is full, anchor the remaining sections of the coping strip and overlap hardware around the entire perimeter. Tighten each anchor firmly but do not over-tighten, which can tear the liner or bend the coping track. The liner should be smooth and tight, with no wrinkles visible from above.

Common mistakes and how to avoid them

The most common mistake is filling the pool too fast. Rushing the fill means you cannot smooth out wrinkles as the water rises, and they become permanent. Budget at least 4 to 6 hours for the fill-and-smooth process. Another frequent error is not drying the pool walls completely before removing the old liner. Wet walls make the old liner stick and the new one slip during installation, leading to misalignment and wrinkles.

A third mistake is not inspecting the coping track and pool floor for sharp edges or debris before installing the new liner. Even a small sharp edge or pebble can puncture the new liner from underneath. Finally, do not anchor the new liner at the top before smoothing it downward. Anchoring too early locks wrinkles in place and makes them impossible to remove without draining the pool again.

Frequently Asked Questions

How long does a new above-ground pool liner last?

Most liners last 8 to 12 years with proper maintenance, though this varies based on sunlight exposure, chemical balance, and how often the pool is used. Liners in shaded areas or pools that are closed in winter tend to last longer than those in full sun or year-round use.

Can I patch a small hole in the old liner instead of replacing it?

Yes, small holes and punctures can be patched with a vinyl repair kit, which costs $10 to $30 and takes about 30 minutes. However, if the liner is more than 8 to 10 years old or has multiple patches, replacement is usually more cost-effective than repeated repairs.

What do I do with the old liner after I remove it?

Old vinyl liners can sometimes be recycled through specialized plastic recycling programs, but most curbside programs do not accept them. Contact your local waste management facility or pool supply store to ask about recycling options in your area. Some pool companies will haul away the old liner for a fee.

Do I need to drain the pool completely, or can I replace the liner with water in it?

You must drain the pool completely. Attempting to replace the liner with water in the pool is unsafe and will damage the pool structure. The water weight will prevent you from removing the old liner and installing the new one correctly.

How much does a replacement liner cost?

Liner prices vary widely based on pool size, shape, and material thickness. A standard 15-foot round pool liner typically costs $200 to $400, while larger or specialty shapes cost more. Check your pool's dimensions and consult your pool manufacturer or a local pool supply store for a price quote.