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Smartline Boulder Swirl 21-Foot Round Liner | UniBead Style | 52-Inch Wall Height | 25 Gauge Virgin Vinyl Material | Strong and Durable Liners | Designed for Steel Sided Above-Ground Swimming Pools

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$379.99

$ 99 .00 $99.00

In Stock

1.Color:Laguna


2.:20 Gauge


  • PRETTY PLEASING PATTERN - Blue rocks top the swirling water backdrop with the Boulder Swirl pattern. The North American cut material is hand-folded to prevent permanent creasing and excess wrinkling. Before installing, lay the liner out in the sun for a minimum of one hour to warm up the vinyl ensuring it is able to stretch when adding water. The best temperatures to install would be between 70-80 degrees.
  • MEASURE TWICE, BUY ONCE – Whether installing for the first time, or replacing an existing liner, the Boulder Swirl pattern offers durability while not breaking the bank. Be sure to check the measurements of your swimming pool to assure the correct size is purchased. Pool height is determined by measuring the outside wall from the ground to underneath the top rail. Round pool size is determined by measuring from the center point wall to wall in order to obtain the diameter.
  • INSTALL IN A SNAP OR A HOOK - This 21' round unibead style liner works with pools with flat-bottoms measuring 52". For an overlap style pool, simply open up the j-hook portion and slip this over the pool wall. For beaded style pools, use the standard bead after removing the j-hook portion along the score or groove mark. This will leave only the standard bead which is inserted into the bead receiver opening. ***Will not work with Intex or Pop-Up pools***
  • STAY COOL IN THE POOL – Enjoy the warm weather while spending quality time with family and friends. Your backyard pool will surely become the place to be during those hot summer days. Stay cool in more ways than one with the Boulder Swirl liner.
  • HIGH QUALITY MATERIAL - Swim carefree knowing your liner can tough it out through abrasion, chemicals and UV fading thanks to the use of Lamiclear technology. The layers are made of an acrylic top coat, a UV resistant print layer, and a 100% virgin vinyl base. This material is then welded and cut for a flawless fit and finish. A 25-year limited warranty is included protecting against defects in material and workmanship.



Product Description

Whether installing for the first time, or replacing an existing line, SmartLine has your pool covered! The strong and durable material is made of 100% virgin vinyl and comes in many unique and beautiful patterns to turn your swimming pool into its own mini paradise! Be sure to measure your pool size correctly before making any purchase.

Liner Knowledge

Comparison of Smart-Line Liner against other brands shows that liner does not fade do you sunlight

SmartLine liners hold up better than many alternatives thanks to an acrylic coated layer on top of its virgin vinyl. Prevent liner fading due to chemicals or UV rays and keep the vibrant colors of your swimming pool liner.

Unibead Liner as Beaded for use with bead receiver

The Unibead connection is designed to operate as either a Standard Bead or a J-Hook pool liner. This liner can replace an overlap pool liner and works with or without bead receiver.

Thermometer showing off the temperature gauge in both Fahrenheit and Celsius

Be sure your environment is suitable before installation! Air temperature should be at least 70-degrees when installing.

A stop-watch with a one-minute clock face plus a sun

SmartLine liners come folded to prevent creasing. Lay out in the sun for at least 1-hour prior to installing to ensure the material is able to stretch when adding water.

Don't Forget To Protect Your Liner!

SmartLine pool liners are very durable, but we suggest protecting your new purchase with a pool pad from Rhino Pad.

Rhino Pad is made from a special cloth fiber that is soft and durable. Defend your liner against cuts and punctures from rocks, roots, grass, glass and other harmful debris found on the ground. It will provide a flat base that gives an extra layer of armor for your swimming pool floor bottom prior to liner installation.


Becky Albers
2025-08-21 13:06:06
My husband and I replaced our liner (& ground leveling) for the first time. We didn’t have any experience with installing liners, but we did our research. I was afraid that the liner would be cheap and thin, but it was opposite. It was easy to install, and it was the exact same liner the company we got a quote to replace our liner was going to install. It’s hard to choose pattern/color from a small picture, but we love the color and pattern of our liner. I don’t ever want to have to switch out a liner, but if we do, I know where we will buy from
Beth Connelly
2025-08-01 10:18:43
I was reluctant to order a liner online but the cost savings won me over. Glad I did!! This liner looks great, was easy to install and top quality. My husband & I did a little 'You Tube' research to make sure we could tackle this alone and with everything we learned we did pretty good. Best tip hands down is that the hotter it is, the better. The sun warms the liner & makes it easier to manipulate on top of the fact it needs to be warm to allow stretching when the water is added. Good purchase!
awsome
2025-06-06 13:37:07
Love the look of the liner, minus its a little thinner than anticipated! Unfortunately the liner was installed and started leaking immediately. After closer look there was a bad seam. We addressed the issues with the company and sent photos of proof of defect. They where quick to replace the liner. I was very pleased at how quickly the replacement liner came! We absolutely loved this liner and can't wait to get the replacement installed! Definitely check seams while your installing it for possible defects.
Chris
2025-04-26 18:43:11
Good quality liner no issues what so ever I installed myself a month ago not to difficult to install alot thicker material then original one the price is higher then normal thinking its because there is a shortage on pool liners but I saved installing it myself so price kinda equaled out and by the way if your installing a liner save your self some time and headache and get the foam coves
littleman
2025-03-23 12:13:59
After the process of installing this liner, we realized that the seams were misaligned a some of the welded seams were sloppy with flap edges throughout the seams. I attempted to contact the seller but no luck. I have had the liner for over a month before I was able to install it, so this voided my possibility of the 30 day return or exchange. Their Quality Compliance department needs serious attention.
Caryn Paoletti
2025-03-18 16:54:32
The colors are vibrant and it fit perfectly
Matt
2025-02-03 16:37:06
Bought this to replace my old leaking liner. The install went much smoother than expected. There are a few wrinkles I was not able to get out simply because it's an aftermarket liner on a 15 year old pool and there was a little extra slack around the top of the pool. The quality of craftsmanship is great and the design looks awesome with crystal clear water.
Customer
2025-01-01 17:25:53
This liner is amazing! It is so easy install with the j-hook liner option you simply hook it over the frame of the pool and fill. I really like the dark coloring and have gotten multiple compliments. The liner is thick but not too thick that you can’t easily get wrinkles out while filling. As you can see in picture it is wrinkled at first but as water fills you can easily push wrinkles out. It fit my pool perfectly and I would recommend to anyone.
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