Winter pool maintenance is a crucial step that every pool owner must consider if they want their backyard oasis to last through the seasons without damage. While covering your pool and balancing the chemicals are common practices, another lesser-known but equally important component is the pool pillow. But do you really need a pool pillow for winter? This guide delves into the purpose, benefits, types, and best practices surrounding pool pillows, helping you make an informed decision for your swimming pool maintenance routine.
Understanding Winter Pool Care Basics
Before diving into the role of a pool pillow, it’s essential to understand the basics of winter pool care. In regions where temperatures drop below freezing during winter, water that remains in the pool lines, filters, and equipment can freeze, expand, and cause expensive damage.
Proper winterization involves:
- Lowering the water level
- Draining and storing filtration systems
- Adding winterizing chemicals
- Installing a sturdy pool cover
However, one area often neglected is protecting the pool cover itself and the delicate balance of water within the pool. This is where the pool pillow steps in.
What Is a Pool Pillow?
A pool pillow, also known as a winter pool pillow or pumpkin pillow, is a large, inflatable, or foam-filled cushion placed under the pool cover during the winter months. It is typically made from heavy-duty vinyl or durable plastic, designed to withstand the rigors of freezing temperatures and pressure from accumulated snow and water.
Despite the name, pool pillows are not meant for comfort — they are engineered for protection. Available in various sizes, pool pillows can be found at most pool supply stores or online retailers that carry winterization kits.
How Does a Pool Pillow Work?
When a swimming pool is closed for the winter, the water still contained in the shell expands slightly as it freezes. If the pool is fully covered without a pillow, this expanding water can put immense pressure on the pool walls, skimmer, and light niches — potentially leading to cracks, shattered tile, or damage to the structure.
By placing a pool pillow in the center of the pool under the cover, you create space for the water to expand safely upwards instead of outwards. This alleviates pressure on the pool’s structure and equipment.
Why You Might Need a Pool Pillow for Winter
Most pool professionals recommend using a pool pillow for in-ground pools in areas that experience freezing temperatures. Let’s break down the advantages:
1. Protection Against Structural Damage
In freezing conditions, the water in your pool can expand as it starts to freeze. Without a buffer, this pressure can be absorbed by the pool walls, which are not designed to handle such internal stress. A pool pillow prevents this by allowing expansion space — a vital function in cold climates.
2. Prevention of Skimmer and Tile Damage
Pool skimmers are particularly vulnerable during winter. Water can freeze inside the skimmer box, which can cause it to crack, pop off, or damage surrounding tiles. A properly installed pool pillow helps distribute the pressure, safeguarding these sensitive areas.
3. Minimized Ice Bag Risk
If you don’t use a pool pillow, water might freeze directly on the pool cover and start to push down with force. This can cause a massive block of ice to shift or sink. When this happens, it might damage the pool cover, walls, or even the bottom of your pool. The pillow acts as a damper.
4. Better Pool Cover Performance
A pool cover that sits directly on the water surface is more likely to sag or tear during winter, especially with heavy snowfall. A pillow lifts the center of the cover up slightly, creating a dome under the cover that pushes water and snow to the edges. This helps prevent water accumulation in the center and also makes spring pool opening easier.
Choosing the Right Pool Pillow
Now that you understand the importance of a pool pillow, it’s essential to choose the correct one for your specific pool type and needs.
Key Considerations When Buying a Pool Pillow
- Size: Your pillow should match the width of your pool or slightly exceed it to provide optimal coverage. Larger pools require larger pillows.
- Material: PVC and vinyl-coated pillows offer the best durability and resistance against cold and UV damage.
- Inflatable vs. Foam: Inflatable models can be adjusted for specific pool dimensions and are compact for storage. Foam-filled pillows don’t need inflating but are heavier.
- Manufacturer Recommendations: Some pool manufacturers specifically recommend certain brands or types of pillows.
Popular Pool Pillow Brands
Here’s a quick comparison of top-rated brands:
| Brand | Material | Inflatable? | Features |
|---|---|---|---|
| Swimline | Vinyl | Yes | Durable seams, winter-tested |
| AquaStar | PVC | No (foam filled) | Ready-to-use, lightweight |
| Blue Wave | Vinyl | Yes | Anti-UV, includes straps |
How to Install a Pool Pillow Properly
Installing a pool pillow isn’t hard, but it does require careful attention to detail to ensure it’s effective.
Supplies You’ll Need:
- Pumpkin pool pillow
- Winter pool cover
- Anchor/sandbags or water bags for cover
- Pool maintenance chemicals
Installation Steps:
- Winterize your pool: Drain the pool to the appropriate level (typically below the skimmer), and add winterizing chemicals.
- Inflate the pillow (if applicable): Ensure it’s stable and secure without over-inflation.
- Place the pillow in the center: Float the pillow in the deepest area of the pool to maximize expansion headroom.
- Secure the winter cover: Make sure to position it over the pool cover straps or weight bags strategically to avoid sagging over the pillow.
- Check and maintain: Occasionally inspect for proper placement throughout the winter if accessible
Mistakes to Avoid:
- Placing the pillow too close to pool edges or equipment
- Underinflating inflatable pillows (which can cause ineffective pressure relief)
- Forgetting to balance winter chemicals before closing
- Leaving pump parts exposed to frost
Pool Cover Types and How They Impact Pillow Placement
Not all covers are designed to work optimally with pool pillows. Understanding the correlation between pool cover types and the pool pillow can help maintain the system’s integrity.
1. Solid Pool Covers
Solid vinyl covers prevent debris and sunlight from entering your pool. They are ideal when used with pool pillows since they form a tight seal but could sag under snow weight. The pillow prevents this by creating a dome, pushing snow and ice to the sides.
2. Mesh Safety Covers
Mesh covers allow rainwater and melted snow to drain off, which some homeowners believe reduces the need for a pillow. However, in freezing climates, even mesh covers can develop ice buildup and sag. Pool pillows help maintain structural safety even in such cases.
Pool Cover and Pillow Compatibility Summary:
| Pool Cover Type | Recommended for Use with Pillow | Why |
|---|---|---|
| Solid Vinyl Cover | Yes | Prevents water buildup on cover; dome formation under the cover pushes snow towards edges |
| Mesh Cover | Yes | Still necessary for internal pressure relief in freezing areas |
| Automatic Pool Covers | No | Designed to withstand weight without pillows; some may damage the mechanism |
When You Might Not Need a Pool Pillow
For all its benefits, a pool pillow isn’t always necessary. Here are specific cases where pool pillows might not be essential:
1. In Areas Without Freezing Temperatures
If you live in a climate that doesn’t regularly face freezing conditions — such as southern Florida, parts of California, or Texas — a pool pillow is not essential. Pool water will not freeze, so expansion pressure won’t be an issue.
2. For Above Ground Pools
Above-ground pool designs typically don’t require pool pillows. The water is usually drained below the skimmer level, and the flexible nature of the pool walls can accommodate minor freezing-related stress without damage.
3. With Some Winter Covers and Systems
Some advanced winter pool cover systems use a solid seal along with special gaskets to manage expansion without a pillow. Always consult with your supplier or installer before skipping one.
The Cost of Skipping a Pool Pillow
You might wonder whether skipping a pool pillow seems worth the risk. Here’s what could happen if you neglect this investment:
1. Cracked or Damaged Skimmer Boxes
Water freezes first around skimmers, where it can expand, crack the box, and even disrupt the plumbing lines. Repairing or replacing a skimmer box can cost hundreds to thousands of dollars.
2. Tile and Wall Damage
When water freezes and expands, it can push outwards against tiles and gunite walls, lifting them off or causing hairline cracks that lead to long-term structural concerns.
3. Costly Pool Cover Replacements
A sagging, water-logged cover can stretch, tear, or rot. Pool covers are expensive to replace, but with the use of a properly placed pillow, their lifespan significantly increases.
Is a Pool Pillow Worth the Investment?
Yes — the relatively small cost of a pool pillow (typically between $40 – $100) pales in comparison to the potential repair and replacement costs from a damaged pool structure. It’s an inexpensive safeguard that provides long-term value.
Pool Pillow vs. Potential Repairs
| Item | Median Pool Pillow Price | Potential Repair Cost |
|---|---|---|
| Pool Pillow | $60 | N/A |
| Skimmer Box | N/A | $500 – $1,000 |
| Cracked Pool Tile | N/A | $200 – $800 |
| Pool Cover Replacement | N/A | $250 – $700 |
Best Practices for Winter Pool Maintenance Beyond the Pillow
Proper winter storage means taking a holistic approach. Here are some professional tips to follow in conjunction with your pool pillow:
1. Balance Pool Chemistry Before Closing
Ensure your pool pH is between 7.2 and 7.6, alkalinity around 100–150 ppm, calcium hardness is above 200 ppm, and chlorine levels are nearly zero. These levels help prevent corrosion and scaling during the winter.
2. Use Winterizing Algaecides
Treat your pool with an appropriate winter algaecide to prevent algae growth that could stain your pool or complicate the opening process.
3. Winterize Equipment
Drain all filters, pumps, and heaters. Wrap the plumbing with insulation or heat tape and winter-proof the automatic cleaner.
4. Secure the Cover Tightly
Make sure the pool cover is anchored evenly around the perimeter using water bags or sandbags to keep rainwater and snow runoff directed to the edges.
Should You Make Your Own Pool Pillow?
Some DIY enthusiasts attempt to create homemade pool pillows using items like inflatable toys or large coolers. However, this approach can be risky, as consumer-grade materials may not withstand freezing temperatures, pressure fluctuations, or snow weight. Commercial pool pillows are tested and guaranteed to resist such elements.
If you do go the DIY route:
- Use a heavy-duty plastic bag filled with air
- Seal it properly to avoid leaks
- Tie it off to keep it in place
However, a store-bought model remains the most reliable and safest option. The investment is worth the peace of mind.
Conclusion: Yes, You Do Need a Pool Pillow for Winter
When properly installed and used in the right climate, a pool pillow can be the difference between an easy spring cleanup and a costly pool repair job. If you live in a cold climate and own an in-ground pool, a pool pillow adds crucial protection against ice pressure, structural damage, and premature wear on your pool cover.
In short, skipping a pool pillow during winter pool closure could cost you far more than the price of the product itself. From safeguarding your pool’s integrity to extending the life of your cover, a pool pillow is an essential tool for every conscientious pool owner in freezing zones. Investing in one is one of the smartest decisions you can make for long-term pool care.
What is a pool pillow and why is it used?
A pool pillow, also known as an antifreeze pillow or a pool cover pillow, is a large inflatable device that pool owners place in their pools before winterizing them. The primary function of a pool pillow is to provide a buffer for expanding water and ice during freezing temperatures. When water freezes, it expands and can push against the pool walls and bottom, potentially causing cracks or structural damage.
By floating in the pool, the pillow occupies space that would otherwise be taken up by expanding ice, thus protecting the pool structure. It is a low-cost solution compared to the potential damage that freezing water could cause. Pool pillows are often used in conjunction with winter pool covers and other winterization chemicals to ensure a pool remains in good condition during cold months. In short, a pool pillow serves a protective role and helps maintain the integrity of a swimming pool through winter.
Can I skip using a pool pillow for winter?
While it is possible to skip using a pool pillow during the winter, doing so could increase the risk of damage to your pool, especially in regions where freezing temperatures are common. A pool pillow serves as an inexpensive preventive measure to absorb the pressure from expanding ice. Without it, ice can push the pool walls and cause cracks or other structural damage. The likelihood and severity of such damage depend on your climate, the type of pool, and how well the pool was winterized.
However, in areas where winter temperatures rarely drop below freezing, the use of a pool pillow might not be as necessary. In above-ground pools, some experts suggest that a properly installed winter cover with adequate water balance can sometimes suffice without the need for a pillow. Still, it’s generally recommended to use one as part of a comprehensive winterization strategy to ensure the longevity of your pool. Always consider the climate and construction type of your pool when deciding whether to use a pool pillow.
How does a pool pillow prevent damage during winter?
A pool pillow prevents damage by displacing water in the pool, creating space for ice to expand upward rather than pressing outward against the pool walls. When water freezes, it expands by approximately 9%, which can exert tremendous pressure on pool structures. By adding an inflatable pillow, pool owners reduce the volume of water that can potentially freeze. This helps to absorb some of the expansion forces, directing the ice upward and away from critical structural components of the pool.
Another way a pool pillow helps is by acting as a buffer for the winter cover. Without a pillow, the cover may sag or even collapse under the weight of ice and snow. The pillow floats underneath the cover, keeping it slightly elevated and preventing water from pooling on top of the cover, which could otherwise lead to tearing or displacement. This simple but effective strategy reduces the potential for costly repairs and keeps the pool safer during the cold months.
How do I properly place a pool pillow in my pool for winter?
Proper placement of a pool pillow is essential to ensure it functions correctly during winter. Begin by ensuring your pool is chemically balanced and the water level is slightly lower than normal—typically about 6 inches below the tile line for in-ground pools. Once the chemical treatment is done and your winter cover is in place, inflate the pool pillow to about 80% capacity to prevent over-expansion and potential bursting as air inside contracts and expands with temperature changes.
Place the fully or partially inflated pillow in the deepest part of the pool. For in-ground pools, it’s usually the deep end; for above-ground pools, the center is typically ideal. Position the pillow under the cover, distributing it evenly so that it covers the maximum possible surface area. Some pool owners use multiple pillows or rope them together for larger pools. Then, secure the cover tightly around the edges to prevent pillow displacement during strong winds or shifts in ice. Follow these steps carefully to maximize protection for your pool throughout the winter.
Can I reuse my pool pillow for multiple winters?
In most cases, a pool pillow can be reused for several winters, provided it is stored properly after each season. Once winter ends and it’s time to open your pool, carefully deflate the pillow and inspect it for any signs of wear, punctures, or leaks. If the pillow is intact and in good condition, it can be folded or rolled up and stored in a dry, cool place until the next winterization period. Storing the pillow indoors protects it from UV rays and extreme temperatures that can degrade the material over time.
However, not all pool pillows are reusable, depending on their material quality and how well they were maintained. Lower-quality or thin plastic pillows may crack or tear during inflation or storage. If the pillow shows signs of damage, it’s wise to replace it to ensure it will perform effectively in the upcoming winter. Replacing an old or damaged pillow before winter begins is a small investment compared to the risk of incurring major pool damage. Always evaluate your pillow’s condition before reusing it.
Do I need a pool pillow with an automatic pool cover?
Even if you have an automatic pool cover, a pool pillow may still be necessary depending on your climate and the type of installation. Automatic covers are tightly fitted and offer excellent protection against debris and evaporation, but they do not eliminate the pressure that ice expansion can place on pool walls. A pool pillow placed underneath can still help absorb some of that pressure and reduce the risk of structural damage.
However, in some pool setups, automatic covers may be accompanied by safety rails or winterization systems designed to handle ice expansion forces. In these cases, a pool pillow might not be required. It’s best to consult with a pool professional or follow the manufacturer’s recommendations for winterizing your specific system. While an automatic pool cover lowers the need for a pillow, it doesn’t always eliminate it entirely, and using one can provide additional peace of mind during colder months.
What are the alternatives to using a pool pillow during winter?
One alternative to using a pool pillow is installing a solid winter cover with proper water chemistry adjustments and a strong support system. Some pool owners also use an airbag with a cover strap system to manage ice expansion forces. Another method involves inserting plastic drain boards or skimmer saver devices to absorb pressure around sensitive areas like skimmers and returns. These items can serve a similar purpose by displacing water volume and managing ice expansion dynamics.
Yet another alternative is simply draining the pool below the frost line, especially for certain portable or inflatable pools. However, for in-ground pools, draining typically isn’t recommended due to the risk of structural damage from groundwater or pressure from a frozen water table. In many cases, using a pool pillow remains the most cost-effective and reliable approach. It’s important to consider your local climate, the type of pool you own, and the winterization guidelines to choose the best alternative or complement to a pool pillow for your situation.