10 Essential Pool Closing Supplies and Safety Gear for a Backyard Pool

Watching the autumn leaves drift across the backyard is a clear signal that pool season has drawn to a close. Leaving a swimming pool vulnerable to freezing temperatures and organic debris invites costly structural damage and a swampy green opening next spring. Securing the right closing supplies and safety gear now ensures the backyard oasis survives the harsh winter completely unscathed.

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Why Proper Winterization Saves Your Pool for Spring

Closing a pool is not just about putting a tarp over the top; it is a critical preservation process that protects a major backyard investment. When water freezes, it expands by about nine percent, exerting massive pressure on plumbing lines, skimmer boxes, and pool walls. Without proper winterization, this expansion can easily crack underground pipes and split expensive concrete or vinyl structures.

Beyond structural defense, winterization is about biochemical control. Allowing organic debris to sit in stagnant water over several months creates a breeding ground for algae and bacteria, turning the pool into a costly clean-up project come May. Taking the time to blow out lines, balance the chemistry, and cover the structure saves hundreds of dollars in spring startup chemicals and physical labor.

Winter Pool Cover – Robelle Super Winter Cover

A solid winter cover is the primary shield against sunlight, heavy snow loads, and windblown debris. It stops photosynthesis in its tracks, preventing algae from taking over the water while keeping out leaves, twigs, and small animals. Without a reliable barrier, the pool water becomes contaminated, requiring extensive filtration and chemical treatment to restore balance in the spring.

The Robelle Super Winter Cover is constructed from heavy-duty polyethylene with a 12×12 scrim count, providing exceptional puncture resistance against falling branches. It features a dark underside to block all light transmission, which is crucial for halting algae growth during warmer spring days before the cover is removed. The heat-sealed seams prevent water from leaking through, keeping the balanced pool water clean and isolated.

• Material: Heavy-duty polyethylene
• Scrim Count: 12×12
• Overlap: 4-foot overlap for secure installation
• Warranty: 10-year limited warranty

This cover comes with a heavy-duty cable and winch tightening system, but users must ensure they select a size that provides a generous overlap beyond the actual pool dimensions. For in-ground pools without anchor systems, water tubes are required to weigh down the perimeter.

This cover is excellent for budget-conscious owners of both above-ground and in-ground pools who want solid, reliable protection without the high cost of a tension safety cover. It is not suitable for those looking for a weight-bearing safety cover that can support the weight of a child or pet walking across it.

Pool Cover Pump – Little Giant APCP-1700

Rainwater and melting snow quickly accumulate on solid covers, creating a heavy pool of stagnant water that stresses the cover seams and risks pulling the entire tarp into the pool. A reliable cover pump automatically evacuates this weight before it causes catastrophic cover failure. Operating a manual pump can be tedious, making an automatic model the smart choice for winter-long peace of mind.

The Little Giant APCP-1700 is an automatic submersible pump designed specifically for this taxing task. It features a built-in mechanical float switch that activates the pump when water reaches two inches deep and shuts off when the level drops below one inch. Delivering up to 1,745 gallons per hour, it clears heavy pooling rapidly while drawing only 270 watts of power.

• Flow Rate: 1,745 GPH at 0 feet of head
• Power Cord Length: 25 feet
• Discharge Connection: Standard 3/4-inch garden hose
• Activation: Automatic float switch

The pump comes with a standard garden hose adapter and an extra-long power cord, meaning extension cords are rarely needed. It is critical to keep the intake screen clear of leaves, as clogged intake holes can cause the motor to overheat and shut down.

This pump is indispensable for anyone using a solid winter cover in regions with heavy winter rain or snow. It is not necessary for those using porous mesh safety covers, which allow water to drain directly through into the pool.

Pool Air Pillow – Swimline 4-Foot Air Pillow

In freezing climates, ice forms on the pool surface and expands outward, putting immense pressure on above-ground pool walls that can cause structural buckling. An air pillow sits in the center of the pool under the cover, acting as an expansion compensator by compressing when ice expands inward. This simple tool absorbs the destructive lateral pressure, protecting the pool pool walls and liner from splitting.

The Swimline 4-Foot Air Pillow is built from rugged, heavy-gauge vinyl designed to withstand extreme cold without deflating. Its large 4×4-foot footprint distributes the pressure evenly, while the heat-sealed edges prevent air leakage under heavy snow loads. It features reinforced grommets on the corners for easy tethering to the pool sides.

• Dimensions: 4 x 4 feet
• Material: Heavy-gauge PVC vinyl
• Grommets: 4 corner tie-down points
• Function: Absorbs ice expansion pressure

A common mistake is inflating the pillow to 100 percent capacity; it should only be filled to 60 to 70 percent capacity to allow room for compression when ice squeezes it. It must be centered using nylon ropes tied to opposite sides of the pool to prevent it from drifting to one side during installation.

This is a non-negotiable tool for above-ground pool owners in regions that experience hard freezes. It is not typically required for in-ground pools, where the surrounding soil absorbs much of the lateral ice pressure.

Winter Chemical Kit – In The Swim Deluxe Kit

Leaving a pool dormant for six months requires a sustained chemical defense to keep the water clear, sanitary, and stain-free. A dedicated winter kit provides slow-releasing sanitizers and stain preventers designed to work in cold, stagnant water. Simply dumping standard pool chemicals in before closing will not provide the long-lasting protection needed to combat late winter algae blooms.

The In The Swim Deluxe Kit is pre-measured for specific pool volumes and contains a powerful combination of winterizing chemicals. It includes a non-chlorine winter shock to oxidize contaminants, a winterizer algaecide to prevent spore growth, and a metal rust/scale inhibitor to protect pool finishes. The standout feature is the slow-releasing winter floating sanitizer, which continually dispenses low levels of sanitizer all winter long.

• Pool Capacity: Kits available for up to 35,000 gallons
• Included Chemicals: Winter shock, winterizer algaecide, stain/scale preventer
• Dispenser Type: Patented slow-release winter floater
• Compatibility: Safe for concrete, vinyl, and fiberglass pools

It is vital to run the pool filter for at least four to six hours after adding the liquid chemicals before dropping the winter floater into the pool. Ensure the pool chemistry is fully balanced (pH, alkalinity, calcium hardness) before applying this kit for maximum chemical effectiveness.

This kit is perfect for pool owners who want a straightforward, all-in-one chemical regimen to ensure a clear spring opening. It is not suitable for those who prefer to source individual, commercial-grade chemicals in bulk.

Pool Line Blower – Cyclone Pro 3 HP Blower

Water trapped inside underground pipes will freeze, expand, and rupture the lines, leading to incredibly expensive excavation repairs in the spring. A pool line blower forces a high volume of low-pressure air through the plumbing system to clear out every drop of water before sealing the lines. Standard shop vacuums often lack the pressure needed to clear deep plumbing runs.

The Cyclone Pro 3 HP Blower is the industry favorite for blowing out pool lines due to its powerful dual-stage motor. Unlike standard vacuums, this unit generates up to 130 CFM of airflow at 3 psi, which is plenty of power to clear lines in deep water. It features a rugged, impact-resistant plastic housing and a heavy-duty bypass switch to protect the motor from overheating during extended runs.

• Motor: 3.0 HP dual-stage
• Airflow: 130 CFM
• Pressure: 3.0 PSI
• Hose Length: 10 feet with quick-connect fittings

Operating this blower requires a secure connection to the skimmer or pump basket using a threaded hose adapter. Users should blow out the shallowest lines first (like the return lines) before tackling deeper suction lines like the main drain to ensure complete clearing.

This tool is ideal for dedicated DIY pool owners with complex in-ground plumbing systems who want to save hundreds on professional closing fees. It is overkill for simple above-ground pools where lines can simply be disconnected and drained manually.

Winter Expansion Plugs – Hayward SP1022C

Once the plumbing lines are blown free of water, they must be sealed at the pool wall to prevent water from re-entering and freezing inside the pipes. Expansion plugs provide a watertight seal in return lines, cleaner lines, and skimmer ports. Without these plugs, the cleared lines will slowly refill with pool water, defeating the entire blowout process.

The Hayward SP1022C plug features a durable nylon body and a heavy-duty wing nut that compresses the rubber gasket for a perfect seal. Unlike cheap generic plugs, these are resistant to pool chemicals and extreme cold, ensuring they will not degrade or slip out of place under pressure. The tapered design allows for easy insertion into 1.5-inch threaded or non-threaded fittings.

• Size: 1.5-inch tapered plug
• Material: Nylon body with neoprene rubber gasket
• Adjustment Type: Heavy-duty wing nut
• Quantity: Sold individually or in multi-packs

Always inspect the rubber gaskets for dry rot or cracking before reusing them from the previous season. Apply a light coat of water-based pool lubricant to the rubber to help slide the plug into place and ensure a tighter seal.

These plugs are essential for any in-ground pool owner winterizing their plumbing lines. They are designed for standard 1.5-inch lines, so pools with 2-inch plumbing will need to source the larger Hayward SP1022D variant.

Skimmer Guard – Gizzmo Ultra Freeze Protection

Water entering the skimmer throat can freeze and expand, easily cracking the delicate plastic skimmer basket housing. Replacing a cracked skimmer is a labor-intensive, expensive repair that often requires cutting into the concrete pool deck. A skimmer guard acts as a sacrificial expansion device inside the skimmer, absorbing the ice pressure so the housing does not break.

The Gizzmo Ultra Freeze Protection is a heavy-duty, hollow plastic tube with integrated threads that screw directly into the bottom of the skimmer line. It is designed to collapse inward under the pressure of freezing water, absorbing the force that would otherwise destroy the skimmer walls. The Ultra model features 1.5-inch and 2-inch double-thread options, making it highly versatile for different plumbing setups.

• Length: 16 inches for deep skimmer wells
• Thread Sizes: Dual 1.5-inch and 2-inch threads
• Material: Heavy-duty, collapsible plastic
• Function: Threaded expansion plug and freeze guard

To ensure a watertight seal, wrap the threads of the Gizzmo with Teflon tape before screwing it into the skimmer. This dual-purpose tool also acts as a line plug, blocking water from entering the pipe while protecting the skimmer itself.

This is a crucial safety device for in-ground pools in freezing climates. It is unnecessary for above-ground pools where the skimmer can simply be disconnected and stored indoors for the winter.

Safety Cover Anchor – Woodtique Brass Anchor

Safety covers rely on heavy-duty springs tensioned to concrete or wood decks using flush-mounted anchors. These anchors must withstand thousands of pounds of pull force from wind, snow, and tension springs without lifting or bending. Over time, cheap anchors can seize or strip out, compromising the safety of the entire cover system.

The Woodtique Brass Anchor is machined from premium, corrosion-resistant solid brass that will not rust or seize up in wet conditions. The screw-in design allows the anchor to sit completely flush with the pool deck during the summer, preventing stubbed toes, and screws upward when it is time to attach the spring straps in autumn. The precision-cut threads prevent cross-threading and ensure smooth operation season after season.

• Material: Solid machined brass
• Size: Fits standard 3/4-inch drilled holes
• Type: Screw-type flush anchor
• Compatibility: Concrete, brick, and stone decks

Installation requires drilling a precise hole in the concrete deck using a rotary hammer drill and a 3/4-inch masonry bit. Adding a small drop of silicone lubricant to the threads before screwing them down for the summer prevents them from seizing up over the warm months.

These anchors are designed specifically for in-ground pool owners utilizing spring-tensioned safety covers on concrete, stone, or wood decks. They are not compatible with standard tarp-style covers that use water bags for weight.

Pool Leaf Net – Blue Wave Leaf Net Cover

Falling leaves in autumn can pile up on top of a winter cover, decaying into a heavy, smelly sludge that makes spring cover removal a nightmare. A leaf net sits on top of the main winter cover during the autumn shedding season and is peeled off once the trees are bare, taking all the debris with it. This simple addition eliminates the need to scoop wet, decaying leaves off the cover in the spring.

The Blue Wave Leaf Net Cover is crafted from durable, woven polyethylene mesh with a tight weave that catches even the smallest leaves. It features a generous 4-foot overlap to ensure complete coverage, and the heavy-duty webbing loops keep the net secure against high winds. This net is exceptionally lightweight, allowing one person to easily pull it off the pool even when loaded with wet leaves.

• Material: High-density woven polyethylene mesh
• Overlap: 4 feet
• Sizing Options: Available for above-ground and in-ground pools
• Fasteners: Includes heavy-duty winch and cable system

The leaf net must be removed before the first hard freeze of winter. Leaving it on during heavy snow risks freezing the net into the main cover, which can cause tearing when you attempt to remove it.

This is a highly recommended accessory for pool owners surrounded by deciduous trees like oaks, maples, or pines. It is not necessary for open backyards with minimal tree canopy.

Cover Patch Kit – Poolmate Winter Patch Kit

Even the toughest winter covers can develop small punctures or tears from falling branches, sharp ice, animals, or wind stress. A small tear can quickly spread, allowing dirty water and debris to contaminate the balanced pool water below. Having a patch kit on hand allows for immediate, watertight repairs to extend the life of the cover.

The Poolmate Winter Patch Kit comes with heavy-duty, self-adhesive patches made from the same durable woven material as standard winter covers. The aggressive, weather-resistant adhesive is designed to bond instantly and cure in cold temperatures, ensuring the patch stays put through wind and snow. The kit includes multiple pre-cut patch sizes in standard colors to match most covers.

• Material: Woven polyethylene patch with adhesive backing
• Colors Available: Green, Blue, and Silver
• Adhesive Type: All-weather, cold-curing adhesive
• Application: Peel-and-stick repair for tears and punctures

Before applying the patch, the area around the tear must be completely clean and dry to ensure proper adhesion. Applying a patch to both the top and underside of the cover provides a double layer of security that will last for multiple seasons.

This is an essential emergency tool for anyone using a solid or mesh winter cover. It is a highly cost-effective alternative to replacing an entire cover due to a minor, easily repairable tear.

How to Maintain Water Balance During the Offseason

Balancing pool water before closing is not a “set-and-forget” task; the water continues to react chemically even in cold weather. The three most critical parameters to dial in before shutting down are pH (7.2 to 7.6), total alkalinity (80 to 120 ppm), and calcium hardness (200 to 400 ppm). If the pH is too high or low during the winter, the water can become corrosive, damaging plaster or vinyl surfaces, or scale-forming, leaving ugly deposits on tiles and steps.

It is a common misconception that algae cannot grow in cold water. While growth slows down significantly below 60 degrees Fahrenheit, a warm spell in late autumn or early spring can trigger a massive algae bloom under a dark cover. Regularly lifting a corner of the cover during these shoulder seasons to check the water level and color allows for early intervention with a quick dose of liquid chlorine or algaecide.

Finally, ensure the pool water level is kept at the proper height below the skimmer mouth based on the cover type. For solid covers, lowering the water 12 to 18 inches below the skimmer prevents ice from expanding up into the tile line. For safety mesh covers, keep the water no lower than 18 inches below the coping to ensure the cover has structural support from the water surface under heavy snow loads.

Taking the time to properly winterize a pool with reliable gear pays massive dividends when the warm weather returns. Skipping steps or using substandard supplies only leads to cracked pipes, ruined covers, and a swampy start to the next swimming season. Invest in quality winterization tools today to guarantee a stress-free, crystal-clear pool opening in the spring.