How and When to Replace Your Inground Pool Liner: A Complete Guide by AQUASTRONG

Inground pool liners are one of the most important yet often neglected parts of pool maintenance. While you might focus on balancing water chemistry, checking your pool equipment, or keeping your pool clean, the liner plays a crucial role in holding thousands of gallons of water. Over time, however, even the toughest liners can wear out, and when that happens, you’ll need to replace it. Here’s everything you need to know about replacing your inground pool liner, including when to replace it and how to choose a new one.

Why Pool Liners Wear Out

Inground pool liners are designed to be durable, but like anything exposed to the elements, they eventually degrade. Here are the common reasons your pool liner may need replacement:

1. Sun Exposure

While sunlight is great for warming up your pool, it can also harm your liner. UV rays from the sun can cause fading and make the vinyl above the water line brittle and weak. Over time, this can lead to cracks and tears.

2. Over-Chlorination

While it's essential to maintain a clean pool, overchlorinating your pool can gradually damage the liner. Excessive chlorine can weaken the vinyl, causing it to become brittle or develop holes.

3. Debris and Storm Damage

Heavy storms, falling tree branches, and debris can damage your liner. Even objects like lawnmower blades or fallen sticks can scrape the liner, leading to cuts or tears.

4. Pet Damage

If you have a pet that enjoys swimming, their claws may scratch the liner. If your dog tries to climb out of the pool using the walls instead of the steps, the liner can be scratched, leading to wear.

5. Temperature Fluctuations

The expansion and contraction of the vinyl with temperature changes can cause it to weaken over time, creating stress points that could lead to tears or damage.

6. Old Age

Even the highest quality inground pool liners will eventually degrade due to age. Most liners last between 5 to 9 years, but with proper care, you may be able to extend their lifespan. After about 15 to 20 years, however, it’s a good idea to replace the liner to avoid leaks.

When to Replace Your Pool Liner

Water Level Drops
If you notice your pool's water level is dropping faster than usual—more than an inch or so per week—there may be a leak in the liner. While some evaporation is natural, a significant water loss could indicate it's time for a replacement.

Visible Damage
If your liner has noticeable holes, tears, or fading, it’s a sign that it might be time to replace it. Small tears can sometimes be patched temporarily, but they may grow larger over time and cause bigger issues.

Cracking or Wrinkling
Aged or damaged liners can start to crack or wrinkle. Cracking is a sign of significant deterioration, and wrinkling can affect the aesthetic of your pool and even cause the liner to tear in certain areas.

How to Choose a New Pool Liner

When it’s time to replace your pool liner, you'll want to choose one that fits your pool perfectly and is durable enough to withstand the wear and tear of pool life. Here are some tips to help you make the best choice:

1. Virgin Vinyl

Look for a liner made from virgin vinyl, which is new, unprocessed vinyl. Virgin vinyl is more resistant to temperature fluctuations and UV damage compared to recycled vinyl, offering you a longer-lasting solution.

2. Liner Thickness (Mil)

Pool liners are typically measured in mil, with 20 mil being a common thickness. A 20-mil liner is 20 thousandths of an inch thick. Thicker liners tend to last longer, but quality is more important than thickness. You can expect a 20 to 25 mil virgin vinyl liner to give you excellent durability.

3. Gauge vs. Mil

While some pool liners are also measured in gauge, mil is a more accurate unit of measure and a better indicator of quality. Gauge numbers can be misleading, so stick to mil when comparing liners.

4. Warranty

Different liners come with different warranties. While warranties can provide peace of mind, make sure you read the fine print. A 20-year warranty may cover only a few issues, so compare terms carefully.

How to Measure Your Pool for a New Liner

Once you’ve decided on your new liner, you need to take accurate measurements to ensure a proper fit. Here’s how to measure your pool:

1. Measure Length and Width
   For rectangular pools, measure the short and long sides twice to ensure accuracy. For round pools, measure across in two spots. Oval pools require measuring the round ends for length and the sides for width.

2. Measure the Corner Radius
   If you have corners in your pool, measure the radius by pulling a tape measure from the corner panel joint and determining the distance where the two walls intersect.

3. Measure the Depth
   Measure both the shallow and deep ends of your pool and subtract the shallow depth from the deep end to get the difference. This will give you the depth measurement necessary for the liner.

4. Measure Four Lengths
   For deeper pools, measure the shallow end, the slope, and the hopper (the flat part of the deep end). You'll also need to measure the back slope (the wall slope at the end of the pool).

5. Consider Hiring a Professional
   If you’re unsure about how to measure or if you have a complex pool shape, it’s best to hire a professional. Incorrect measurements can result in an ill-fitting liner and wasted money.

How to Replace Your Pool Liner

Replacing an inground pool liner can be a challenging task, and improper installation can lead to serious issues. If you're unsure, it’s always a good idea to hire a professional installer. If you decide to do it yourself, here’s an overview of the steps involved:

1. Drain the Pool
   Make sure to drain the pool carefully to avoid damaging the pool structure. Always follow local regulations regarding water disposal.

2. Remove the Old Liner
   Carefully remove the faceplates, gaskets, and any other accessories. Cut the old liner into smaller sections to make removal easier.

3. Repair Any Pool Wall Damage
   Before installing the new liner, inspect the pool walls for cracks or damage. Repair these areas to prevent issues in the future.

4. Install Wall Foam
   Apply foam to the pool walls to help protect the new liner and provide additional cushioning.

5. Place the New Liner
   Unfold the new liner and begin installing it from the shallow end, ensuring that it fits snugly into the bead track.

6. Use a Shop-Vac to Remove Air
   To get rid of air pockets and wrinkles, use a Shop-Vac to vacuum out the air and smooth the liner.

7. Fill the Pool
   Once the liner is in place and secure, begin filling the pool with water. Be sure to monitor the filling process to prevent overflow.

8. Install Accessories
   When the water reaches the shallow end, reinstall the faceplates, gaskets, and any steps or ladders.

Final Thoughts

Replacing your inground pool liner is a big job, but with the right tools and some patience, it can be done successfully. Whether you’re dealing with normal wear and tear, or you’ve noticed a leak, replacing your liner ensures that your pool continues to function properly and looks great. If you’re unsure about any part of the process, it’s always best to hire a professional to ensure everything is done correctly.

At AQUASTRONG, we believe in offering high-quality pool products that help you maintain your pool with ease. From pool pumps to filtration systems, we’ve got everything you need to keep your pool clean and your liner protected. Ready to replace your pool liner? Get in touch with AQUASTRONG today for expert advice and the best pool products on the market!