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Help Protect Above-Ground Pool Walls with a Winter Pillow
Manage winter cover shape, standing water, perimeter tension, and changing weather without treating an inflatable pillow as a structural wall brace.
An above-ground pool relies on sound wall panels, stable ground support, secure rails, a usable liner, and the correct winter water level. A centered pool pillow works indirectly by raising part of a flexible cover and reducing one deep collection area. A more balanced cover profile may help prevent rainwater, wet snow, leaves, and ice from pulling heavily toward one section of the pool perimeter.
- Made with 0.5 mm cold-resistant PVC
- Recommended inflation: about 70%
- Stated material range: β25Β°C to 80Β°C
- Available in 6 square and rectangular sizes
- Flat sizes range from 3 Γ 3 ft to 4 Γ 15 ft
- Mini Boston-style valve
- Reinforced metal grommets
- Securing rope and instructions included
- Air pump or blower not included
- Not designed as a rigid wall or snow support
What Wall Protection Really Means
A winter pillow cannot increase the strength of steel, resin, or hybrid wall panels. Its value comes from helping manage the cover above the pool while the original wall structure, liner, rails, water, and prepared base continue performing their normal functions.
Preserve Existing Wall Strength
Wall panels should already be straight, securely connected, and properly seated before the pool is closed. A pillow cannot restore strength to a bowed panel, weakened wall seam, loose joint, missing fastener, or area damaged by corrosion.
Maintain Internal Water Support
Water applies outward pressure across the liner and pool wall. Keeping the winter water level within the pool manufacturerβs instructions helps preserve that support while allowing the required clearance around skimmers, return fittings, plugs, and the cover.
Limit Uneven Cover Pull
A deep water or snow pocket can pull the cover more heavily toward one side. Raising the central area may make the cover profile less uneven, but standing water removal and balanced perimeter fastening remain essential throughout winter.
How Winter Weight Reaches the Wall
Rainwater, wet snow, ice, and debris press downward on a flexible winter cover. As the middle drops, the cover pulls toward its cable, clips, straps, anchors, rails, and other attachment points around the pool perimeter.
Downward Cover Pressure
A small depression can become deeper after several storms. Water and wet debris repeatedly move toward the lowest area, pulling more cover material inward and increasing pressure on the surrounding fastening system.
Perimeter Tension
As the center moves down, the edges become tighter. When overlap or fastening is uneven, one rail, strap, cable point, clip, or wall section may carry more tension than the opposite side.
Changing Load Direction
Winter loads rarely stay in one location. Wind moves leaves and snow, sunlight creates meltwater, and colder nights refreeze uneven areas. The strongest pull may shift several times before spring opening.
Inspect the Wall Before Covering
Complete a full walk-around while the pool is still open and easy to inspect. Wall movement, corrosion, loose joints, and missing hardware are easier to identify before the cover blocks the upper edge.
Confirm Wall Alignment
Stand several feet away and view the wall from more than one direction.
- Look for leaning or bowed sections
- Compare opposite sides of the pool
- Check whether uprights remain vertical
- Look for gaps between connected parts
- Note any area outside the normal pool shape
A wall that appears different from the previous season should be checked before additional cover tension is applied.
Examine Corrosion Areas
Inspect steel parts where moisture commonly remains.
- Check around the skimmer opening
- Inspect the wall seam and fasteners
- Look near the bottom track
- Watch for flaking or swollen metal
- Separate surface staining from deep corrosion
Holes, weakened seams, or damaged screw areas require more attention than light surface discoloration.
Check Wall Connections
Review all accessible joints and hardware.
- Confirm bolts and screws are present
- Check wall ends and joining plates
- Inspect upright-to-rail connections
- Look for cracked resin components
- Tighten only according to pool instructions
Do not use the winter cover or pillow ropes to pull loose structural parts back into position.
Keep the Required Water Level
There is no single winter water height for every above-ground pool. The correct level depends on the wall design, liner, skimmer, return fittings, winter plugs, plumbing method, and cover instructions.
Support the Pool Interior
Water presses outward against the liner and wall. Draining too far can remove part of that normal support, especially when the exposed wall is later affected by wind, frost movement, or uneven ground settlement.
Protect Skimmers and Returns
Some systems require water below the skimmer or return opening. Others use winter covers, plugs, or specialized fittings that allow a higher level. Follow the instructions for the installed equipment rather than relying on a general measurement.
Maintain Cover Clearance
The water level controls the distance between the pool surface, pillow, and winter cover. A level that is too low may create a deep unsupported drop, while excessive water may interfere with fittings or cover placement.
Check for Water Loss Before Winter
Unexpected water loss can change both wall support and cover clearance. Inspect the liner, fittings, plugs, and visible seals before covering, then record the starting water level for later comparison.
Inspect the Liner Surface
Look for cuts, punctures, pulled corners, severe wrinkles, or sections separating from the wall. Mark any suspicious area so its condition can be compared during spring opening or after an unexpected level change.
Review Pool Fittings
Check the skimmer, return opening, plugs, gaskets, and nearby liner material. A slow leak around one fitting may be difficult to locate after the cover is installed and the surrounding area begins freezing.
Record a Fixed Measurement
Measure the distance from the water surface to one permanent rail or wall reference. A written measurement provides a clearer comparison than trying to remember the original level several weeks later.
Review the Upper Pool Structure
Top rails, joint caps, plates, and fasteners help maintain the pool shape and form the perimeter around which many winter covers are installed. Loose or damaged parts may increase uneven cover movement.
Tighten Loose Components
Check whether rail sections, joint caps, plates, and visible screws remain seated. A loose section may lift or shift when wind moves the cover or standing water increases downward pull.
Remove Sharp Contact Points
Exposed screws, cracked plastic, rough metal, and damaged clips may cut the cover or pillow. Repair or protect these areas using a method approved for the pool before winter installation.
Compare Rail Height
Walk around the pool and compare the rail line. A noticeably high or low area may indicate loose hardware, wall movement, base settlement, or a connection that requires closer inspection.
Check the Support Beneath the Wall
Pool wall stability also depends on the bottom track, prepared base, support blocks, surrounding soil, and drainage. A pillow cannot correct erosion, frost movement, or settlement below the pool.
Inspect the Bottom Track
Look for visible sections that have lifted, sunk, separated, or lost supporting material. The pool wall should remain seated without abrupt changes in track height or gaps beneath the lower edge.
Review Support Blocks
Check whether upright supports, pavers, or base plates remain level and fully supported. A tilted or cracked block may indicate soil movement, erosion, or uneven loading around the pool.
Control Yard Drainage
Rainwater and pump discharge should move away from the pool base. Water repeatedly flowing toward one wall can soften soil, wash away material, freeze around the track, and increase settlement risk.
How the Pillow Helps Indirectly
The pillow floats beneath the cover rather than attaching to the pool wall. Its main purpose is to change the cover profile, create a compressible air chamber, and reduce one pronounced central depression.
Raise the Middle Area
A centered chamber lifts part of the cover above the water. Rain and snowmelt may still collect, but the main low point can become shallower and less concentrated.
Leave a Compressible Zone
Air inside a partly inflated pillow can give under changing pressure. This creates a softer central area than a rigid object and allows the cover to respond more gradually.
Provide a Visual Reference
The raised area helps show whether the pillow remains near the middle. A high point moving toward one wall may indicate drifting, uneven rope tension, or movement caused by wind.
Inflate to About 70%
Maximum inflation is not required for winter cover lift. The pillow should hold a rounded form while remaining slightly soft enough to respond to hand pressure, colder air, and changing cover loads.
Allow for Temperature Changes
Air contracts in colder conditions and expands when temperatures rise. Leaving unused space gives the chamber room to respond without remaining under maximum pressure during warmer periods.
Reduce Continuous Seam Stress
Overinflation increases tension around welded edges, corners, the valve, and grommet reinforcement. About 70% inflation provides a useful shape without creating a stretched, hard chamber.
Create a Gentler Cover Rise
A slightly flexible pillow allows the cover to settle across a broader area. A hard chamber may create a narrow peak and pull the cover more tightly toward the perimeter.
Use the Pillow Within Its Design Range
EPN pool pillows use 0.5 mm cold-resistant PVC with a stated material temperature range of β25Β°C to 80Β°C. Material thickness supports normal winter use but does not eliminate damage caused by sharp contact, poor storage, or overinflation.
Protect the PVC Surface
Carry the pillow over smooth ground and avoid rough concrete, exposed screws, frozen branches, tools, and broken plastic. A puncture can occur even when the material is thicker than standard lightweight vinyl.
Avoid Deep Storage Creases
Clean and dry the pillow before folding. Loose folds are preferable to repeatedly pressing the same sharp crease, especially when the PVC is cold and less flexible.
Separate Temperature from Load
Cold resistance describes material behavior within the stated range. It does not create a structural snow rating or guarantee protection from excessive ice, trapped debris, or concentrated cover pressure.
Select Enough Lift Without Crowding the Wall
A larger pillow creates a broader raised area but also needs more water-surface space, air, cover slack, storage space, and handling room. The listed dimensions are measured before inflation.
| Pillow Size | Flat Area | Wall-Clearance Consideration |
|---|---|---|
| 3 Γ 3 ft | 9 sq ft | Compact lift with more open water |
| 5 Γ 5 ft | 25 sq ft | Moderate central coverage |
| 6 Γ 6 ft | 36 sq ft | Broader square rise |
| 8 Γ 8 ft | 64 sq ft | Needs ample water area and cover slack |
| 4 Γ 8 ft | 32 sq ft | Fits elongated center areas |
| 4 Γ 15 ft | 60 sq ft | Requires long-axis clearance |
Measure the Usable Water Area
Measure between internal obstructions rather than using only the outside pool diameter. Skimmers, ladders, fittings, and cover hardware may reduce the space available around the inflated chamber.
Consider the Inflated Footprint
The flat size becomes smaller when the panels curve upward. Even so, enough open water should remain to prevent continuous contact with wall fittings and rails.
Plan for Cover Movement
A broad pillow needs sufficient cover material to settle naturally around it. Limited slack may create a sharp ridge or increase tension near one section of the perimeter.
Keep the Chamber Away from Hard Parts
The pillow should remain near the usable center with open space around its inflated edges. Long-term rubbing against rails, skimmers, returns, ladders, or plugs can damage the PVC.
Maintain Open Water
Choose a size that leaves room around the chamber.
- Compare the inflated area with the water surface
- Leave space near the skimmer wall
- Avoid crowding ladders or steps
- Keep corners away from rail joints
- Check clearance before adding the cover
The pillow does not need to fill the pool to create a useful central rise.
Check Fixed Fittings
Identify every hard component before installation.
- Locate the skimmer and return fitting
- Check winter plugs and plates
- Remove ladder hardware where required
- Look for exposed screws or edges
- Note any item hidden after covering
A few inches of movement can matter when a rigid fitting sits close to the PVC.
Use Rope for Guidance
Keep rope tension moderate and balanced.
- Use opposing grommet positions
- Avoid one very short rope
- Leave slight movement available
- Keep knots outside the cover
- Recheck tension after 24 hours
Rope should limit drifting without pulling one edge of the pillow toward the wall.
Balance Tension Around the Perimeter
A centered pillow cannot correct a cover that is too tight on one side. Spread and secure the cover gradually so overlap, cable position, clips, and straps remain reasonably even.
Compare Cover Overlap
Check the amount of material extending beyond the top rail at four or more locations. A short section may become tight before the opposite side has been aligned.
Fasten Opposing Sides
Move between opposite areas rather than completing one side first. Gradual fastening reduces the chance of dragging the pillow toward the wall or concentrating pull on one rail.
Separate Rope Functions
Pillow rope controls pillow position. Cover cables, straps, clips, anchors, or weights secure the cover. One system should not replace the other.
Understand the Weight Above the Pool
Water weight builds quickly even when a puddle appears shallow from ground level. One gallon of water weighs approximately 8.34 lb, excluding leaves, dirt, ice, or wet snow.
| Water Volume | Approximate Weight | Likely Cover Condition |
|---|---|---|
| 10 gal | 83 lb | Small local depression |
| 25 gal | 209 lb | Broad shallow puddle |
| 50 gal | 417 lb | Repeated rain or thaw |
| 75 gal | 626 lb | Deep unattended basin |
| 100 gal | 834 lb | Major surface accumulation |
Consider the Load Location
Fifty gallons spread across several areas may affect the cover differently from fifty gallons collected near one wall. Concentrated water can increase tension on the nearest rail and fastening points.
Use Approved Removal Equipment
A pool pillow does not drain the cover. Use a cover pump, siphon, or drainage system only when suitable for the installed winter cover and current weather conditions.
Route Discharge Away
Pump hoses should carry water away from the pool base. Releasing large volumes beside one wall may soften soil, erode support material, or freeze around the bottom track.
Expect the Load to Change
Snow depth alone does not show how much weight is resting on the cover. Rain, compression, sunlight, refreezing, and wind can change both density and load position.
Fresh Snow
Light powder contains trapped air and may initially place less weight on the cover. Repeated snowfall compresses earlier layers and reduces the open space between snow particles.
Wet Snow
Warming temperatures and rain increase density. A shallow layer of wet snow can weigh more than a much deeper layer of dry powder and may settle into existing low areas.
Refrozen Meltwater
Snowmelt may collect around leaves and freeze overnight. Uneven ice pockets can become difficult to remove and may shift as temperatures change again.
Recheck the Setup After 24 Hours
The pillow, cover, ropes, water surface, and fastening system may settle during the first day. Early changes are easier to correct before heavy rain, snow, or freezing conditions begin.
Compare the Cover Profile
Walk around the pool and observe the raised area from several directions. A broad central rise is preferable to a sharp ridge or high point close to one wall.
Review Perimeter Tension
Check cover overlap, cable position, clips, straps, and rail contact. One section should not appear much tighter or more stretched than the opposite side.
Check Water and Air Levels
Compare the waterline with the recorded measurement and review the pillow shape. A major change may indicate leakage, a loose valve, seam damage, or strong cover pressure.
Watch for Changes Around the Pool
Visible changes may show that the cover load, wall condition, water level, or pillow position needs attention. Do not tighten the cover or ropes until the likely cause has been identified.
| What You Notice | Possible Cause | First Check |
|---|---|---|
| One edge becomes very tight | Uneven cover load | Compare the full perimeter |
| Raised area moves toward the wall | Pillow drift | Check opposing ropes |
| Water level drops | Liner or fitting leak | Compare recorded measurements |
| Wall begins to bow | Structural or base movement | Stop adding tension |
| Top rail starts lifting | Loose hardware or uneven pull | Inspect rail connections |
| Deep puddle forms at one side | Cover or debris shift | Manage approved surface load |
| Grommet area stretches | Rope tension is excessive | Reduce and rebalance the rope |
Stop When the Wall Moves
Do not attempt to straighten a bowed, leaning, or separating wall by pulling cover or pillow ropes. Reduce added surface load where safe and arrange a proper inspection.
Investigate Water Loss
A lower water level reduces internal wall support and changes cover clearance. Check accessible liner areas, fittings, plugs, and drainage equipment before assuming evaporation is responsible.
Correct Tension Gradually
When one section appears much tighter, review water accumulation, cover overlap, fastening order, and pillow position. Make only small adjustments from outside the pool.
Above-Ground Pool Wall Care FAQs
Does a Pool Pillow Directly Support the Wall?
No. The pillow floats beneath the cover and does not brace the pool frame. Its role is to create a raised cover area and leave a compressible chamber near the center.
Why Does the Winter Water Level Matter?
Water supports the liner and applies outward pressure against the wall. The required level also depends on the skimmer, return fittings, plumbing method, and winter-cover system.
Can a Pillow Fix a Bowed Wall?
No. Bowing may result from structural damage, corrosion, ground settlement, incorrect water level, or loose connections. The cause should be evaluated before winter closing continues.
Should the Pillow Touch the Wall?
Long-term contact is best avoided. Keep the pillow near the center and away from rails, ladders, skimmers, returns, plugs, and other rigid components.
How Much Air Should Be Added?
Inflate to about 70%. The chamber should appear rounded while remaining slightly soft when pressed by hand.
Can the Pillow Support Heavy Snow?
No structural snow-load rating is stated. The product changes cover shape but should not be treated as a beam, brace, roof support, or walking surface.
When Should the Pool Be Checked?
Inspect after 24 hours, heavy rain, strong wind, major snow, rapid thawing, a hard freeze, and periodically during stable weather.
What If the Water Level Drops?
Compare the level with the starting measurement. Check the liner, skimmer, return fitting, winter plugs, and drainage equipment for possible leakage.
Can an Above-Ground Pool Be Left Empty?
Many above-ground pools are not designed to remain empty outdoors. Follow the pool manufacturerβs winter-closing instructions before lowering the water.
Is a Pump Included?
No. The package includes the pillow, securing rope, and instructions. A compatible low-pressure pump or blower must be prepared separately.
Prepare the Whole Pool for Winter
A winter pillow works best when the wall, liner, water level, rails, track, ground, cover, and drainage system have already been checked.
Before covering the pool:
- Check the wall for leaning, bowing, or corrosion
- Confirm rails, joints, and fasteners remain secure
- Inspect the bottom track and surrounding ground
- Check the liner and fittings for water loss
- Record the required winter water level
- Inflate the pillow to about 70%
- Keep the chamber away from hard fittings
- Fasten the cover gradually around opposing sides
- Route pump discharge away from the pool base
- Recheck the setup after 24 hours
- Inspect again after major winter weather
EPN pool pillows use 0.5 mm cold-resistant PVC and are available in six square and rectangular sizes. Choose enough central coverage to improve the cover profile without crowding the pool wall or reducing fitting clearance.
