Finding the right accessories for your pool is key to its care. If you’re wondering what size pool pillow for 18 round pool, you’re in the right place. Getting the correct size is crucial for protecting your pool cover and making winterization easier. A pool pillow, or air pillow, sits under your cover to absorb pressure from ice and snow. This guide will walk you through everything you need to know to choose the perfect one.
An 18-foot round pool is a popular size, and it needs specific gear. Using the wrong size pillow won’t provide the support your cover needs. This can lead to a sagging cover, collected water, and potential damage. We’ll cover sizing, installation, and tips to make your pool closing smooth and effective.
What Size Pool Pillow For 18 Round Pool
The direct answer is simple. For a standard 18-foot round above-ground pool, you typically need a pool pillow that is 18 inches in height and 48 inches in diameter. This is often listed as an 18″ x 48″ round air pillow. This size provides adequate surface area to support the center of your pool cover effectively.
It’s the most common recomendation from pool manufacturers and winter cover companies. The pillow should be placed directly in the center of the pool, under the cover. Its job is to create a gentle dome, allowing rain and melting snow to run off towards the edges.
Why the Right Size Matters So Much
You might think a slightly bigger or smaller pillow would work. But precision here saves you trouble. A pillow that’s too small won’t lift the cover enough. Water will pool in the center, adding dangerous weight. This can strain your pool walls and even cause the cover to tear or collapse into the water.
A pillow that’s too large can be just as problematic. It can stretch the cover too tightly, putting stress on the seams. It might also push against the pool walls awkwardly. The 18″ x 48″ size is engineered to create the ideal slope for an 18-foot round structure. It balances lift and coverage perfectly.
Understanding Pool Pillow Measurements
When you shop, you’ll see pillows listed with two numbers. The first number (18″) usually refers to the height or thickness of the pillow when inflated. The second number (48″) refers to its diameter—how wide it is across. Think of it like a short, wide cylinder.
- Height (18″): Determines how much lift it provides.
- Diameter (48″): Determines how much surface area it supports.
Together, these dimensions create the right amount of buoyancy. They displace just enough water to make your cover taut and functional all winter long.
What If I Have an Oval or Different Shaped Pool?
The “18 round” specifys a circular pool. If your 18-foot pool is oval, the requirements change. For oval pools, you often need a rectangular pool pillow. A common size for an 18-foot oval pool is a 4-foot by 6-foot rectangular pillow. Always check your cover’s manual for the manufacturers recommendation.
Step-by-Step Guide to Installing Your Pool Pillow
Once you have your 18″ x 48″ pillow, proper installation is next. Follow these steps to do it right.
- Partially Inflate the Pillow: Never inflate it completely. Fill it with air until it’s firm but still has some give. You should be able to press down on it slightly. This allows for expansion and contraction with temperature changes. Use a standard air pump or even a hair dryer on a cool setting.
- Attach the Tethers: Most pillows come with built-in grommets or tie-downs. Securely attach the provided ropes or cords. If it didn’t come with any, use soft nylon rope. Avoid anything abrasive that could puncture the pillow or your liner.
- Position in the Center: Carefully place the pillow in the dead center of your pool. For a round pool, this is easy to eyeball, but you can measure from the walls to be sure. It should float freely in the middle.
- Secure the Tethers: Cross the ropes over the top of the pillow in an “X” pattern. Tie each end to a stable point on the pool’s top rail. Do not tie them too tightly. The pillow should be able to move a little with water pressure, but not drift to the side.
- Place Your Winter Cover: Drape your cover over the pool and pillow. The pillow should create a noticeable central bump. Ensure the cover’s center is directly over the pillow.
- Secure the Cover: Use your cover’s cable and winch system, water tubes, or cover clips to fasten the cover snugly around the perimeter. The cover should be tight, with a slight slope from the center pillow out to the edges.
Common Mistakes to Avoid
Even with the right size, errors can cause problems. Here’s what to watch out for.
- Over-Inflating: This is the number one mistake. An over-full pillow can burst when the air inside expands on a warm day, or when ice puts pressure on it. Leave it soft.
- Under-Inflating: If it’s too soft, it won’t do its job. Water won’t run off properly.
- Poor Centering: A off-center pillow creates an uneven cover slope. Water will collect in the low area, risking damage.
- Using Sharp Tie-Downs: Wire or sharp plastic cords can rub and create holes. Always use soft rope.
- Forgetting to Re-check: Check the pillow’s inflation level a day or two after installing the cover, and again after a big temperature swing. It may need a tiny bit more air or a slight release.
Alternative Sizes and When to Consider Them
While 18″ x 48″ is standard, you might see other options. Some companies sell a 16″ x 48″ pillow. This can work for an 18-foot pool if your cover is particularly flexible or if you have a smaller water volume. However, the 18-inch height is generally prefered for optimal lift.
In very heavy snow climates, some pool owners opt for two smaller pillows instead of one large one. They place them evenly along the pool’s center line. This can distrubute weight differently. But for most people, one correctly sized central pillow is simpler and just as effective.
Maintaining Your Pool Pillow Season to Season
A good pool pillow can last several years with proper care. Here’s how to maintain it.
- Clean Before Storage: When you open your pool, deflate the pillow completely. Wash it with mild soap and water to remove any algae or dirt. Rinse it thoroughly.
- Dry Completely: Let it air-dry in the sun, inside and out. Make sure no moisture is trapped inside, as this can lead to mold.
- Check for Leaks: Inflate it slightly and listen for hisses or submerge it in a bathtub to look for bubbles. Patch any tiny holes with a vinyl repair kit.
- Store Properly: Fold it loosely or roll it up. Store it in a cool, dry place away from direct sunlight and rodents. Don’t store it with sharp objects.
Taking these steps prevents suprise deflations next fall. It’s a small task that extends the life of your equipment significantly.
Answering Your Top Questions
Let’s tackle some frequent questions pool owners have about this topic.
Can I use a pool noodle or water bottles instead?
It’s not recommended. Pool noodles don’t provide enough consistent lift or surface area. Water bottles can shift, puncture, and are unreliable. A dedicated air pillow is designed for the job and is a relitively small investment for protecting your larger pool cover and pool structure.
What if my pillow deflates during the winter?
If you notice a sagging cover mid-winter, it’s likely the pillow. If it’s safe to do so, you can carefully remove snow from the cover and try to add air. Often, it’s easier to replace it. Keeping a spare on hand isn’t a bad idea for peace of mind.
Do I really need a pillow for an above-ground pool?
Yes, it’s highly advised. The pressure from ice expansion is real and can damage your pool walls and liner. The pillow acts as a shock absorber. It also makes opening your pool in spring much cleaner, as it prevents a giant puddle of stagnant water on the cover.
How tight should the ropes be?
The ropes should be snug but not guitar-string tight. The pillow needs to float and adjust. If the ropes are too tight, they can pull the pillow under the water’s surface when the cover gets weighted down, which defeats the purpose.
Choosing a Quality Pool Pillow
Not all pillows are created equal. Look for these features when you buy:
- Durable Material: Look for UV-resistant, heavy-duty vinyl. It should feel thick and puncture-resistant.
- Reinforced Seams: Seams are weak points. Well-heat-sealed or welded seams are more reliable than glued ones.
- Secure Grommets: The tie-down grommets should be strongly attached, not just punched through the vinyl.
- Warranty: A good product will often come with a multi-year warranty against defects.
Spending a few extra dollars on a reputable brand pays off in durability and performance. It’s frustrating to have a pillow fail halfway through a harsh season.
The Role of the Pillow in Overall Winterization
Remember, the pool pillow is just one part of closing your pool for winter. It works in concert with other steps:
- Balancing the water chemistry.
- Lowering the water level below the skimmer.
- Draining pumps and filters.
- Using a quality cover that fits well.
- Securing the cover properly with a winch and/or water bags.
Neglecting any of these steps can compromise your winter protection. The pillow supports the cover, but the cover keeps out debris. The chemistry prevents algae, and draining equipment prevents freeze damage. It’s a complete system.
Final Checklist Before You Finish
Before you walk away from your closed pool, run through this list:
- Pillow is 18″ x 48″ (or the correct size for your pool).
- Pillow is inflated to 80-90% capacity.
- Pillow is centered in the pool.
- Tethers are secure but not overly tight.
- Winter cover is centered with the pillow creating a central dome.
- Cover is securely fastened around the entire perimeter.
- No tools, leaves, or debris are left on the cover.
Taking an extra ten minutes to verify everything can prevent a headache months later. You’ll thank yourself in the spring when your pool is easier to open and in great condition.
FAQ Section
Q: What is the standard pool pillow size for an 18 foot round pool?
A: The standard size is an 18-inch by 48-inch round air pillow. This is the perfect fit for supporting the cover on an 18′ round above-ground pool.
Q: Can I use a 16×48 pillow for an 18 round pool?
A: You can, but it may not provide ideal lift. The 18×48 size is specifically recommended for better support and water runoff. The taller profile handles snow load better.
Q: How do you measure for a pool air pillow?
A: You measure your pool’s diameter. For round pools, the pillow diameter should be roughly proportional. The common rule is a 48-inch diameter pillow for pools between 15 and 24 feet round. Always check your cover manual for its specific recommendation.
Q: Where should the pillow be placed in a round pool?
A: Always in the exact center. This ensures even pressure distribution and allows for proper water runoff to all sides of the pool cover.
Choosing the right equipment makes pool maintenance simpler. Knowing what size pool pillow for 18 round pool is a fundamental part of that. With the correct 18″ x 48″ pillow, installed carefully and maintained well, you can protect your investment and enjoy a smoother pool season transition. Your pool will be ready and waiting for you when warmer weather returns.