8 Essential Winterization Gear Items for a Backyard Pool

As the autumn air cools and the swimming season draws to a close, looking out at a backyard pool can bring a sense of chore-induced dread rather than relaxation. Leaving a pool exposed to freezing temperatures, heavy snow, and falling debris is a recipe for catastrophic damage that will ruin the next summer before it even begins. Equipping a pool with the proper winterization gear is the only way to shield a major backyard investment from the harsh reality of the off-season.

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Why Proper Pool Winterization Protects Your Investment

Water is a powerful force, especially when it transitions from liquid to solid ice. When water freezes inside pool plumbing, skimmers, or against the pool walls, it expands by approximately nine percent. This expansion exerts immense pressure, easily cracking PVC pipes buried deep underground, splitting heavy-duty plastic skimmer wells, and tearing pool liners.

Repairing freeze damage is an incredibly expensive and invasive process. It often involves tearing up concrete decking, excavating backyard soil, or replacing structural walls. Investing in dedicated winterization gear prevents these structural failures, keeping the pool sealed, dry, and protected until the spring thaw.

Beyond mechanical protection, proper winterization preserves water quality. Closing a pool with the right gear keeps light, organic matter, and pests out of the water. This ensures that opening the pool in the spring is a quick, painless process rather than a multi-week battle against a swamp-green algae bloom.

Critical Steps to Take Before Installing Your Winter Gear

Before any winterization gear is deployed, the pool water must be thoroughly prepared. Skipping the preparation phase renders even the best winter covers and plugs ineffective. Start by brushing the walls and vacuuming the pool floor to remove all organic debris, as leaves and twigs left behind will decay and stain the pool plaster or liner over the winter.

Next, test and balance the pool chemistry to protect the pool surfaces from staining and scaling during months of stagnation. Pay close attention to pH, total alkalinity, and calcium hardness. Once balanced, run the filtration system for at least 24 hours to distribute the chemicals evenly before lowering the water level below the skimmer mouth.

Finally, inspect all winter gear for wear and tear from previous seasons. Check expansion plugs for dry rot, inspect safety cover straps for fraying, and ensure the line blower is functioning properly. Having everything clean, balanced, and inspected makes the physical closing process run smoothly and efficiently.

Safety Pool Cover – Loop-Loc Mesh Safety Pool Cover

A safety pool cover is the ultimate barrier between winter elements and the pool. Unlike cheap tarps held down by water bags, a safety cover is anchored directly into the pool deck, creating a tight trampoline-like surface. This prevents children, pets, and wild animals from accidentally falling into the water while keeping heavy debris from entering the pool.

The Loop-Loc Mesh Safety Pool Cover is the industry standard for securing a pool through harsh winters. Constructed from ultra-strong, lightweight polypropylene mesh, it allows rainwater and melting snow to drain through into the pool while filtering out fine debris and leaves. This eliminates the need for a cover pump and prevents dangerous standing water from pooling on top of the cover.

• Material: Lightweight, high-tensile polypropylene mesh
• Anchoring System: Corrosion-resistant brass anchors and stainless steel springs
• Safety Rating: Exceeds ASTM F1346-91 standards for safety swimming pool covers
• Sizing Options: Custom fit for various pool shapes and standard rectangular sizes

When installing a Loop-Loc cover, precise measurements are critical, especially for freeform pools. The brass anchors must be drilled into a stable concrete deck, pavers, or wood decking using specialized anchor inserts. This cover is perfect for homeowners in high-wind or heavy-snow regions who prioritize safety and durability; however, it is not ideal for those who prefer to keep all sunlight out of the pool, as mesh covers do allow some light penetration which can encourage early spring algae growth.

Expansion Plug – Anderson Rubber Expansion Plug

When water freezes inside a pool’s return lines, cleaner lines, or drain lines, the resulting expansion can easily split PVC piping. An expansion plug is inserted into these open pipe orifices after they have been blown dry. It creates a watertight seal that prevents water from re-entering the plumbing from the pool vessel.

The Anderson Rubber Expansion Plug is a rugged, reliable choice designed to withstand extreme cold and high pressure. Built with a heavy-duty, marine-grade rubber body and a corrosion-resistant stainless steel wing nut, this plug expands evenly inside the pipe wall when tightened. The ribbed rubber exterior ensures a non-slip grip that won’t back out under freeze pressure.

• Material: Heavy-duty neoprene rubber with stainless steel hardware
• Design: Ribbed body for maximum grip and sealing surface
• Sizes Available: Standard 1.5-inch and 2-inch options, along with custom fractional sizes
• Application: Sealing return inlets, cleaner lines, and skimmer bottoms

Before purchasing, measure the internal diameter of the pool lines to ensure a perfect fit. When tightening the wing nut, hand-tighten firmly until the rubber bulges slightly; overtightening can strip the threads or damage delicate plastic pool fittings. This plug is an absolute necessity for any pool owner in freezing climates, while it is less critical for pools located in mild regions that do not experience sustained hard freezes.

Skimmer Guard – Gizzmo Ultra Skimmer Protector

The skimmer is one of the most vulnerable parts of an in-ground pool during the winter. Rain and snow collect in the skimmer throat, and when this water freezes, it expands outward, easily cracking the plastic skimmer housing. A skimmer guard absorbs this freeze expansion, collapsing inward to relieve the pressure on the skimmer walls.

The Gizzmo Ultra Skimmer Protector is a heavy-duty, blow-molded plastic tube designed specifically to absorb the destructive expansion of freezing water. It features a unique double-thread design on the bottom, allowing it to screw directly into both 1.5-inch and 2-inch skimmer threads. This creates a watertight seal while acting as a sacrificial pressure chamber.

• Thread Sizes: Dual 1.5-inch and 2-inch male threads
• Length: 16 inches for deep skimmer wells
• Material: Heavy-duty, collapsible blow-molded plastic
• Special Feature: Built-in blowout channel with a removable top plug

Before installing the Gizzmo, wrap the threads with Teflon tape to ensure a tight, leak-free seal. The Gizzmo is a must-have for in-ground pool owners with plastic skimmers in freezing zones. It is not designed for above-ground pool skimmers, which are typically winterized by removing the hose and using a simple winter faceplate.

Pool Air Pillow – Robelle Heavy-Duty Ice Equalizer

Above-ground pools face a unique threat during freezing winters. When ice forms across the surface of the pool, it expands outward, pushing directly against the pool’s metal walls and liner. An air pillow sits in the center of the pool under the winter cover, creating an expansion void that forces the ice to freeze inward toward the pillow rather than outward against the walls.

The Robelle Heavy-Duty Ice Equalizer is built from thick, puncture-resistant vinyl designed to survive extreme winter weather. It features a secure, leak-proof air valve that prevents deflation under heavy snow loads. By displacing water in the center of the pool, it also prevents heavy water and ice accumulation from bowing the pool walls inward.

• Material: 16-gauge heavy-duty vinyl
• Sizes Available: 4×4 feet, 4×8 feet, and 4×15 feet options
• Inflation Method: Standard air pump valve with secure plug
• Grommets: Reinforced corner grommets for easy centering with ropes

Only inflate the pillow to 60 percent to 70 percent of its capacity. Fully inflating the pillow leaves no room for compression, causing it to pop when ice squeezes it or snow piles on top. This gear item is essential for all above-ground pool owners using solid covers, but it is completely unnecessary for in-ground pools protected by tensioned mesh safety covers.

Winter Chemical Kit – In The Swim Ultimate Closing Kit

Leaving pool water untreated for six months leads to organic staining, scale buildup, and a massive algae bloom come spring. A winter chemical kit provides a slow-release, balanced dose of sanitizers and protectants designed to keep the water clear and chemically stable in cold temperatures.

The In The Swim Ultimate Closing Kit is a comprehensive, pre-measured chemical package that simplifies the winterization process. It features a powerful copper-free algaecide to prevent green and black algae, a non-chlorine shock to destroy organic contaminants, and a slow-release winter floater that distributes sanitizer over several months. Additionally, the kit includes a metal stain remover to protect the pool surface from mineral deposits.

• Kit Capacities: Formulated for pools up to 10,000, 20,000, or 35,000 gallons
• Algaecide Type: Non-foaming, copper-free winter algaecide
• Floater Lifespan: Up to 5 months of slow-release sanitization
• Contents: Winter shock, algaecide, stain rust scale preventer, and a winterizing floater

Be sure to dissolve the dry chemicals in a bucket of water before pouring them into the pool, and run the pump for several hours to distribute them. This kit is ideal for pool owners looking for a hassle-free, all-in-one chemical solution to guarantee a clean spring opening. It is not suitable for those who prefer to buy bulk individual chemicals and custom-blend their winter recipe.

Pool Cover Pump – Little Giant APCP-1700 Automatic

For pools utilizing solid winter covers, standing water is a constant enemy. Rain and melting snow collect in the center of the cover, creating a heavy pool of water that can stress the cover seams, pull anchors out of the deck, or sink the cover entirely. A reliable cover pump automatically evacuates this water before it can cause damage.

The Little Giant APCP-1700 Automatic Cover Pump is a workhorse engineered to handle the demands of outdoor winter exposure. It features an integrated mechanical float switch that automatically turns the pump on when water reaches two inches deep and shuts it off when the surface is clear. This hands-off operation ensures the cover remains dry even during heavy storms when nobody is home.

• Flow Rate: Up to 1,745 gallons per hour (GPH)
• Power: 1/3 HP motor with a 25-foot power cord
• Activation: Automatic mechanical float switch (no manual monitoring needed)
• Connection: Standard 3/4-inch garden hose thread adapter

Position the pump on a flat, stable area of the cover, and ensure the discharge hose runs to a proper drainage area away from the pool deck. This pump is an absolute necessity for solid winter covers and tarps. It is completely useless for mesh safety covers, which allow water to pass directly through into the pool.

Pool Leaf Net – Blue Wave Bronze Round Leaf Net Cover

If a pool is surrounded by deciduous trees, autumn can be a nightmare. Wet, rotting leaves landing on a pool cover turn into a heavy, tea-colored sludge that is incredibly difficult to remove in the spring. A leaf net acts as a temporary catch-all that sits on top of the main cover to capture falling leaves, allowing them to be easily lifted off in one clean motion.

The Blue Wave Bronze Round Leaf Net Cover is constructed from heavy-duty, woven polyethylene mesh with a generous overlap that ensures full coverage. The fine mesh weave allows wind to dry out the trapped leaves so they blow away, or allows the pool owner to easily pull the net off, dumping the dry leaves in the yard. It comes equipped with a rugged cable and winch system to tighten the net securely around the pool perimeter.

• Material: Heavy-duty, UV-protected woven polyethylene
• Overlap: 3-foot overlap to ensure complete coverage of the winter cover
• Securing System: Heavy-duty plastic-coated steel cable and brass winch
• Sizes: Available in standard round, oval, and rectangular dimensions

The leaf net must be removed before the first hard freeze and snow accumulation. If left on during a freeze, the wet leaves and net will freeze solid to the winter cover, defeating the purpose of the product. This tool is perfect for pool owners with heavy tree cover, but is a redundant expense for yards with no overhanging trees.

Pool Line Blower – Cyclone Pro 3 HP Bypass Blower

Blowing out underground plumbing lines is the most critical step in preventing catastrophic freeze damage. Standard shop vacs often lack the air volume (CFM) and pressure required to push water out of deep lines, especially main drains. A dedicated pool line blower delivers high-volume air to completely clear water from the plumbing.

The Cyclone Pro 3 HP Bypass Blower is the gold standard for pool professionals and serious DIYers alike. Its powerful 3 HP motor generates massive air pressure, capable of clearing lines up to 15 feet deep. It features a bypass motor design, meaning the cooling air for the motor is separate from the air being blown into the pool lines, preventing the unit from overheating during tough blowouts.

• Motor: 3 HP bypass motor
• Performance: Generates up to 130 CFM of air volume
• Housing: Durable, rust-proof plastic housing with a heavy-duty handle
• Hose Connection: 2-inch quick-disconnect outlet with a flexible hose adapter

Using the Cyclone Pro requires a proper connection adapter (usually a 1.5-inch or 2-inch threaded quick-connect) to attach to the pump basket or skimmer line. This heavy-duty blower is ideal for pool owners who want to winterize their own pools safely without hiring a service. It represents a larger upfront investment but pays for itself in just one or two seasons of avoided service fees.

How to Blow Out Pool Lines to Prevent Freeze Damage

Blowing out pool lines requires a methodical approach to ensure no water remains in the pipes to freeze and expand. Start by lowering the pool water level below the skimmer mouth. Hook up the Cyclone Pro Blower to the pump basket or the skimmer line using a secure threaded adapter, ensuring all other valves on the manifold are closed.

Turn on the blower and open the valve to the shallowest return line first. You will hear air rushing through, followed by a violent bubbling and misting at the return outlet in the pool. Once the line is blowing pure air with no water mist, quickly insert an Anderson Rubber Expansion Plug into the return nozzle and tighten the wing nut to seal the line under pressure.

Repeat this process for each subsequent return line, working from the closest to the furthest from the equipment pad. For the main drain at the bottom of the pool, blow air until a massive geyser of bubbles appears in the deep end. Quickly close the main drain valve at the equipment pad to create an “air lock,” which utilizes air pressure to keep water from creeping back up the pipe, even without a plug.

Storing Your Summer Filtration Equipment for the Winter

Once the pool lines are blown out and sealed, the summer filtration equipment must be prepped for hibernation. Leaving water inside pumps, filters, or heaters will cause plastic housings and copper heat exchangers to crack during a hard freeze. Begin by removing the drain plugs from the bottom of the pump basket, filter tank, and pool heater.

• Pump Motor: Store the pump motor in a dry, indoor location like a basement or garage to protect the electrical windings from moisture.
• Pressure Gauge: Unscrew the delicate pressure gauge from the filter head and store it indoors; water trapped behind the dial face will freeze and ruin the calibration.
• Salt Cell: If the pool utilizes a saltwater chlorine generator, remove the salt cell, clean it with a mild acid solution if scale is present, and store it indoors.

Keep all the small drain plugs, O-rings, and pressure gauges in one secure place, such as the pump basket itself, so they are not misplaced during the off-season. Cover the remaining heavy outdoor equipment, like the filter tank and heater, with a breathable, heavy-duty tarp. Avoid using tight plastic wraps that trap condensation, which leads to rust and premature component failure.

Taking the time to systematically winterize a backyard pool using high-quality, dedicated gear is the single best way to protect this recreational investment. When spring arrives, removing a secure cover to find clear, clean water and undamaged plumbing makes the effort of a thorough winter closing worth every minute.