10 Essential Winterizing Above Ground Pool Supplies for a Backyard Pool

As the autumn leaves begin to fall and the summer heat fades, backyard pool owners must shift their focus from recreation to preservation. Skipping proper seasonal maintenance can turn a pristine oasis into a costly, swampy nightmare come spring. Securing the right tools now ensures that your above ground pool survives the freezing temperatures and harsh winter debris completely unscathed.

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Why Proper Winterization Prevents Costly Spring Repairs

Freezing water expands by about nine percent, exerting massive outward pressure on pool walls, plumbing, and skimmer boxes. Without proper preparation, this expansion can easily crack plastic fittings, split hoses, and warp the steel frame of an above ground pool. Repairing structural damage or replacing a torn vinyl liner in May is vastly more expensive than investing in protective gear in October.

Beyond structural protection, closing a pool correctly keeps light and organic debris from fueling algae blooms during the off-season. Opening a green, swampy pool requires hundreds of dollars in shock treatments, clarifying chemicals, and hours of filtration time. A proactive winterizing strategy seals out contaminants and stabilizes the water, ensuring a crystal-clear, stress-free opening when warm weather returns.

Winterizing Kit – In The Swim Ultimate Winter Pool Kit

A winterizing kit is the chemical foundation of your off-season pool care, designed to keep water sanitized and stain-free for months. Without circulating water, algae and mineral deposits can easily take over the pool wall surfaces. The In The Swim Ultimate Winter Pool Kit simplifies this battle by bundling pre-measured doses of winterizing powder, stain rust scale preventer, and a non-chlorine shock.

What sets this kit apart is its patented slow-release winter floater, which continuously dispenses a non-chlorine oxidizing agent throughout the cold months. This constant sanitation prevents the chemical “dead zones” that typically allow algae to bloom as soon as the weather warms.

• Compatible pool sizes: Up to 10,000, 20,000, or 35,000 gallons
• Active ingredients: Non-chlorine shock, winterizer compound, chelating stain agent
• Included hardware: One-time-use time-release chemical dispenser

When using this kit, remember that chemical distribution is critical; run the pool filter for at least four to six hours after adding the components to ensure complete mixing. This kit is ideal for owners looking for an all-in-one chemical solution, but those with exceptionally heavy iron or mineral content in their water may still need a dedicated metal chelator beforehand.

Pool Cover – Robelle Premium Winter Cover

A solid winter cover acts as a physical shield, blocking sunlight to stop photosynthesis while keeping heavy leaves, twigs, and windblown dirt out of the pool. Allowing organic matter to rot in your pool water over the winter ruins water chemistry and stains vinyl liners. The Robelle Premium Winter Cover provides the durability required to withstand high winds and heavy snow loads.

Constructed from heavy-duty polyethylene, this cover features a 12 x 12 scrim count (threads per inch) that resists tearing under stress. The top side is treated to resist UV degradation, while the black underside prevents sunlight penetration to keep algae from growing.

• Overlap size: 4-foot overlap (crucial for above ground pools with top rails)
• Material: Heavy-duty UV-stabilized polyethylene
• Securing system: Heavy-duty plastic-coated cable and rust-resistant aluminum winch

Ensure you measure your actual pool dimensions rather than relying on memory, and always purchase a cover that accounts for the top rails. This cover is perfect for regions experiencing heavy winter winds and snow, though budget-focused pool owners in mild climates might find it heavier than strictly necessary.

Pool Air Pillow – Blue Wave 4-Foot x 4-Foot Air Pillow

When rainwater and melted snow freeze on top of your pool cover, the ice expands outward, pushing directly against the pool walls. An air pillow sits in the center of the water, acting as a sacrificial pressure cushion that collapses under ice pressure to protect the pool structure. The Blue Wave 4-Foot x 4-Foot Air Pillow is built specifically to handle this extreme compression.

Made from heavy-duty 16-gauge vinyl, this pillow features a reliable freeze-resistant valve that prevents air leaks during sub-zero temperatures. Its square shape distributes the ice pressure evenly in all directions, preventing the cover from bowing inward and straining the top rails.

• Dimensions: 4 feet by 4 feet
• Material: Heavy-duty 16-gauge vinyl
• Best use: Round and oval above ground pools up to 24 feet in diameter

A common mistake is fully inflating the pillow; only fill it to 60% to 80% capacity to allow room for compression. Use nylon ropes tied to opposite sides of the pool to keep the pillow centered, making this a non-negotiable insurance policy for anyone living in freeze-prone northern climates.

Cover Pump – Little Giant APCP-1700 Cover Pump

Accumulated rain and melted snow on top of a pool cover can weigh thousands of pounds, stressing the pool walls and dragging the cover into the water. A submersible cover pump safely removes this water, preserving the structural integrity of both the cover and the pool frame. The Little Giant APCP-1700 Cover Pump is a reliable choice for hands-off water removal.

This pump features an automatic switch that detects water levels, turning the pump on when water reaches two inches and shutting it off when the surface is clear. It pumps up to 1,745 gallons per hour, quickly clearing even the heaviest downpours without manual monitoring.

• Flow rate: 1,745 GPH at 0 feet of head
• Power cord: 25-foot heavy-duty cord
• Connection: Attaches to a standard 3/4-inch garden hose

Keep the pump intake screen clear of leaves and debris, as a clogged intake will restrict water flow and can burn out the motor. It is an essential tool for pool owners in rainy or snowy climates, but may be overkill for dry desert environments where water accumulation is minimal.

Winter Cover Seal – Gladon Winter Cover Wrap

High winter winds can get under a pool cover, lifting it like a sail and pulling the securing cables loose. This flapping action damages the cover fabric and allows cold air, dirt, and leaves to slip underneath. Gladon Winter Cover Wrap acts as a giant, heavy-duty shrink-wrap layer that seals the gap between the cover and the pool wall.

This wrap is made from a high-strength, UV-inhibited stretch film that clings to itself without leaving sticky adhesive residue on your pool rails. By wrapping the perimeter of your pool multiple times, you block wind from getting beneath the cover, keeping it secure even during winter storms.

• Material: Linear low-density polyethylene stretch film
• Roll size: 80-gauge thickness, typically 500 feet per roll
• Compatibility: All round and oval above ground pools

For best results, pull the film tight as you walk around the pool, overlapping each layer by fifty percent to create an airtight seal. This is an indispensable accessory for backyard pools in open, windy suburban lots, though it is a single-use item that must be replaced every autumn.

Skimmer Cover – Aquador Skimmer Winter Faceplate

Draining your pool below the skimmer mouth to winterize it puts unnecessary stress on the pool liner and risks drying it out. A skimmer faceplate cover seals the skimmer opening from the inside, allowing you to keep the pool water at its normal operating level all winter. The Aquador Skimmer Winter Faceplate eliminates the hassle of draining and refilling your pool.

The Aquador system replaces your existing skimmer faceplate with a specialty frame that accepts a snap-on plastic lid. This lid forms an airtight and watertight seal over the skimmer mouth, protecting the plastic skimmer body from freezing water and cracking.

• Models available: Standard (Aquador 1090) and Widemouth (Aquador 1010)
• Seal type: Snap-on freeze-resistant plastic lid
• Required installation: Requires unscrewing the old faceplate and replacing it with the Aquador frame once

Make sure to order the exact size matching your current skimmer model (standard vs. wide-mouth) to avoid leaks. This product is a massive time-saver for pool owners who want to avoid draining thousands of gallons of balanced water every autumn.

Expansion Plug – Hayward SP1022C Rubber Plug

After clearing the water from your pool return lines, you must seal them off to prevent water from seeping back in and freezing inside the pipes. A rubber expansion plug expands inside the pipe opening to create a reliable, watertight barrier. The Hayward SP1022C Rubber Plug is the industry benchmark for securing these critical winterization points.

Made from high-grade, chemical-resistant rubber, this plug features a durable nylon wing nut and non-corrosive metal parts. Turning the wing nut compresses the rubber, forcing it to expand tightly against the inside walls of your 1.5-inch return line.

• Size: 1.5-inch diameter (standard pool return size)
• Material: Heavy-duty rubber with corrosion-resistant hardware
• Application: Threaded or smooth return fittings

Before inserting the plug, inspect the inside of your return fitting for any debris or algae that might prevent a perfect seal. It is a simple, low-cost piece of insurance that every pool owner needs, though you must ensure your plumbing matches the standard 1.5-inch size before buying.

Leaf Net Cover – Robelle Supreme Leaf Net

If your backyard is surrounded by deciduous trees, autumn leaves will pile up on your winter cover, creating a heavy, rotting muck pile. Trying to scoop wet, heavy leaves off a pool cover in the freezing cold is backbreaking work. The Robelle Supreme Leaf Net sits on top of your main winter cover, catching all falling leaves before they can decompose.

This net is constructed from a highly durable, lightweight polyethylene mesh that allows water to pass through while trapping leaves and twigs. Once the trees are bare, you simply peel the leaf net off the pool, leaving your main cover clean and free of heavy debris.

• Material: Heavy-duty polyethylene mesh
• Overlap: 3-foot overlap for easy securing
• Included hardware: Heavy-duty cable and winch system

The key to using a leaf net successfully is removing it before the first hard freeze, as frozen leaves will anchor the net to the cover and make removal impossible. It is highly recommended for wooded properties, but unnecessary for open yards with no surrounding trees.

Skimmer Guard – Gizzmo Ultra Skimmer Protector

Water that sneaks into your skimmer box can freeze and expand, cracking the delicate plastic housing and causing a major underground leak. A skimmer guard acts as a dual-purpose device: it plugs the plumbing line at the bottom of the skimmer while providing a collapsible core to absorb ice expansion. The Gizzmo Ultra Skimmer Protector is designed precisely to handle this high-stress job.

This rugged, hollow plastic tube features heavy-duty threads at the bottom and is designed to deform and collapse under ice pressure, neutralizing the forces that would otherwise shatter the skimmer walls. It features a built-in blow-out tube path to allow easy line clearing.

• Length: 16 inches (designed for deep skimmers)
• Thread size: 1.5-inch and 2-inch dual threads
• Material: Heavy-duty, collapsible molded plastic

Wrap the threads of the Gizzmo with Teflon tape before screwing it into the skimmer drain to ensure a watertight seal that won’t seize up by spring. This is a crucial item for pool owners in deep-freeze areas who do not use a hard skimmer faceplate cover.

Pool Antifreeze – Swimline Non-Toxic Antifreeze

Even after blowing out your pool plumbing, small pockets of water can pool in low-lying elbow joints and underground pipes. When this residual water freezes, it can split PVC pipes, leading to expensive excavation repairs in the spring. Swimline Non-Toxic Antifreeze provides an extra layer of safety by lowering the freezing point of any remaining water.

Formulated from propylene glycol, this antifreeze is completely non-toxic and safe for vinyl liners, copper, and PVC plumbing. It is specifically engineered for pool systems and will not harm swimmers or balance chemicals when the pool is reopened and backwashed.

• Chemical base: Non-toxic propylene glycol (never use ethylene glycol)
• Protection level: Down to -50°F (-45°C)
• Bottle size: 1-gallon containers

Always blow out the plumbing lines with air before adding the antifreeze, using the chemical as a safety net rather than a primary solution. Never use automotive antifreeze in your pool, as it is highly toxic to humans, pets, and local wildlife.

Mid-Winter Maintenance Tasks to Keep Your Pool Safe

Winterizing your pool is not a “set-and-forget” task; seasonal check-ins are necessary to prevent mid-winter failures. Periodically inspect your winter cover for sagging, and use your cover pump to clear standing water before it freezes into heavy ice sheets. Leaving hundreds of pounds of ice on the cover ruins its elasticity and places extreme structural load on the pool walls.

Keep an eye on your air pillows to ensure they remain inflated and centered under the cover. If a pillow deflates, slide a replacement underneath immediately to keep ice pressure from concentrating on the pool walls. Additionally, gently brush away heavy, wet snow accumulations from the top of the cover using a soft-bristled pool brush rather than a metal shovel, which can easily slash through the cover material.

Taking the time to properly seal and protect your above ground pool now saves you time, money, and stress when the warm weather returns. With the right protective gear in place, you can rest easy all winter long knowing your backyard oasis is safe. When spring arrives, you will be rewarded with clear water and an effortless pool opening.