10 Essential Winter Pool Closing Supplies for Freezing Climates

As the autumn wind turns crisp and leaves begin to drop, backyard pools in freezing climates face their toughest annual test. Ignoring proper seasonal preparation can lead to cracked plumbing, ruined liners, and thousands of dollars in spring repair bills. Investing in heavy-duty, reliable winterizing gear is the only way to safeguard these valuable water recreation investments against the relentless forces of sub-zero winter weather.

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Why Freezing Climates Require Heavy-Duty Winterizing

When water freezes, it undergoes a physical transformation that exerts up to 30,000 pounds of pressure per square inch. In freezing climates, this expansion acts like a slow-motion hydraulic jack inside underground plumbing lines, skimmer assemblies, and pump equipment. Cheap, thin plastics and flimsy tarps simply cannot withstand these extreme mechanical forces over a long winter.

Standard pool equipment is designed to handle moving, liquid water, not the shifting weight of heavy snow and solid ice sheets. Without heavy-duty winterizing, water trapped inside PVC pipes will split the schedule-40 plastic wide open. Replacing cracked underground lines requires excavating the concrete pool deck, turning a simple seasonal chore into a massive construction project.

Proper winterization requires a systematic approach to displacing water, sealing openings, and absorbing ice expansion. Every component must be rated for sub-zero temperatures and structural stress. Using the right gear ensures that the pool remains completely sealed and protected until the spring thaw arrives.

Pool Safety Cover – Loop-Loc Brass Anchor Safety Cover

An inground pool safety cover acts as a structural shield, preventing heavy snow loads, debris, and wandering wildlife from falling into the pool basin. Unlike cheap tarps held down by water bags, a safety cover is anchored directly into the deck under high tension. This tension allows the cover to support immense weight while keeping the pool completely sealed off from the elements.

The Loop-Loc Brass Anchor Safety Cover is the gold standard for this task due to its legendary break strength and ultra-durable construction. It utilizes double-webbing straps and heavy-duty stainless steel springs anchored by flush-mount brass inserts. The mesh fabric allows rainwater and melted snow to drain through into the pool, preventing dangerous water accumulation on the surface.

• Material: Superdense mesh or solid vinyl options
• Anchor Type: Flush-mount solid brass anchors
• Weight Capacity: Designed to support the weight of an elephant in emergencies
• Warranty: 15-year pro-rated manufacturer warranty

Installing this cover requires drilling holes into the concrete or paver deck using a rotary hammer drill, which presents a brief initial learning curve. Once the brass anchors are set, however, seasonal installation and removal take less than thirty minutes with the included installation rod. The brass anchors screw flush into the deck during the summer, leaving a perfectly safe, stub-free surface.

This safety cover is ideal for homeowners in heavy snow zones who want absolute peace of mind regarding child and pet safety. It is not a good fit for temporary renters or those unwilling to make permanent anchor installations in their pool decking.

Pool Air Pillow – Robelle 4×15 Foot Ice Equalizer

Above-ground pools are highly vulnerable to ice expansion, which can push outward against the steel walls and split the pool liner. A pool air pillow, or ice equalizer, is placed in the center of the water under the winter cover to act as a pressure relief valve. As the surface water freezes and expands inward, it compresses the air pillow instead of pushing outward against the pool structure.

The Robelle 4×15 Foot Ice Equalizer stands out because of its thick, heavy-gauge vinyl construction and elongated shape. The 4×15-foot dimensions make it highly effective for larger oval and rectangular pools, distributing the ice compression load over a wider surface area. Its rugged valves are designed to resist leaking, ensuring the pillow remains inflated under pressure all winter long.

• Dimensions: 4 feet wide by 15 feet long
• Material: Heavy-duty, freeze-resistant PVC vinyl
• Grommets: Reinforced corner holes for easy centering
• Recommended Use: Above-ground pools and solid-covered inground pools

To use this pillow correctly, inflate it to only 60% to 80% of its total capacity. Over-inflating the pillow leaves no room for compression, which can cause the vinyl seams to pop when the ice sheet begins to squeeze. Secure the pillow in the exact center of the pool using nylon ropes tied to opposite sides of the pool wall.

This product is an absolute necessity for above-ground pool owners facing hard freezes. It is not necessary for inground pools utilizing free-draining mesh safety covers, as those covers do not trap standing water on top.

Winter Chemical Kit – In The Swim Ultimate Winter Kit

Closing a pool with clean, balanced water is only half the battle; those chemicals must remain active for up to six months to prevent staining and algae. A dedicated winter chemical kit provides slow-release protection that performs reliably in cold, dark water. This prevents a massive cleanup headache when the cover is pulled back in the spring.

The In The Swim Ultimate Winter Kit contains pre-measured doses of winterizing oxidizer, stain rust and scale preventer, and a specialized winterizer. It also features a unique, time-release winter floater packed with non-chlorine sanitizer that slowly dispenses over the off-season. This combination keeps the water pristine without bleaching the pool liner or damaging safety covers.

• Pool Sizing: Available for pools up to 10,000, 22,000, and 35,000 gallons
• Kit Contents: Winterizing powder, stain inhibitor, winter clarifier, and a slow-release floater
• Compatibility: Safe for plaster, fiberglass, and vinyl liner pools
• Chemical Base: Non-chlorine sanitizers to prevent liner bleaching

Before adding these chemicals, the pool water must be balanced, and the water temperature should drop below 60 degrees Fahrenheit. Adding winter chemicals to warm water causes them to dissipate too quickly, leaving the pool unprotected during the late autumn months. Run the pool filter for at least four hours after adding the kit to ensure complete distribution throughout the water column.

This kit is perfect for busy pool owners who want a straightforward, pre-packaged chemical regimen. It is not intended for pools with active filtration systems that run year-round in temperate zones.

Cover Pump – Wayne WAPC250 Automatic Utility Pump

For pools using solid covers or tarps, water accumulation from autumn rain and melting winter snow is a constant threat. Hundreds of gallons of standing water create a heavy, stagnant swamp that can pull the cover into the pool and stress the pool walls. A dependable, submersible cover pump is required to clear this water automatically before it freezes solid.

The Wayne WAPC250 Automatic Utility Pump is engineered specifically to operate unattended in harsh winter environments. It features smart sensing technology that automatically turns the pump on when water reaches 2-1/8 inches and shuts off when the surface is dry. The i-Frame protection cage prevents debris from clogging the intake, while the oil-free design protects the pool liner.

• Flow Rate: Moves up to 3,000 gallons per hour
• Activation Sensor: Automatic electronic switch (no mechanical float to freeze)
• Power Cord: 25-foot heavy-duty power cord
• Discharge Connection: Standard 3/4-inch garden hose adapter

When setting up this pump, ensure the discharge garden hose is laid out flat without any kinks or loops where water could trap and freeze. A frozen block of ice inside the discharge hose will deadhead the pump, causing it to overheat and fail. Store the pump indoors during deep freeze spells if there is no standing liquid water on the cover to protect the internal seals.

This pump is essential for anyone using solid safety covers, vinyl winter tarps, or leaf nets. It is not needed for mesh safety cover systems, which naturally allow water to drain directly through into the pool.

Skimmer Guard – Gizzmo Ultra Skimmer Expansion Plug

The skimmer is one of the most vulnerable parts of an inground pool because water naturally collects in its throat. If this water freezes, the expanding ice will split the plastic skimmer basket housing, leading to a major underground leak. A skimmer guard is a hollow, collapsible tube designed to screw into the skimmer drain line and absorb this compression.

The Gizzmo Ultra Skimmer Expansion Plug is the industry standard for protecting inground skimmer wells. Its heavy-duty, blow-molded plastic body is designed to collapse under ice pressure, neutralizing the forces that would otherwise crack the skimmer walls. The Ultra model features a dual-thread design that fits both 1.5-inch and 2-inch internal skimmer threads.

• Thread Sizes: 1.5-inch and 2-inch tapered male threads
• Length: 16 inches for deep skimmer wells
• Material: High-density, collapsible polyethylene
• Feature: Built-in blowout channel with cap for line clearing

Before screwing the Gizzmo into place, wrap the threads with three to four wraps of Teflon tape to ensure a watertight seal. This prevents water from slowly seeping past the threads and entering the main plumbing line over the winter. The top of the Gizzmo should remain above the expected water line in the skimmer to keep the expansion chamber functional.

This product is an absolute necessity for any inground pool owner in a freezing climate. It is not intended for above-ground pools, where the skimmer is typically disconnected and drained entirely for the winter.

Expansion Plugs – Blue Devil Rubber Winterizing Plugs

Once the water is blown out of the pool’s return lines and cleaner lines, those openings must be sealed completely. If water wraps back around and re-enters the pipes, it will freeze and crack the plumbing just below the pool wall. Heavy-duty rubber expansion plugs expand inside the pipe to create a reliable, airtight barrier.

The Blue Devil Rubber Winterizing Plugs are designed to withstand constant water pressure and extreme sub-zero temperatures. They feature premium, marine-grade rubber bodies that resist chemical degradation and ozone cracking. The non-corrosive nylon wing nuts and stainless steel bolts allow for high-torque tightening without stripping or rusting.

• Size Options: Sizes ranging from #0 (1/2 inch) up to #14 (4 inches)
• Hardware: Rust-resistant stainless steel bolt and nylon wing nut
• Body Material: High-stretch vulcanized rubber
• Application: Sealing return jets, cleaner lines, and main drains

Selecting the correct size requires measuring the inner diameter (ID) of the pipe or fitting you intend to plug, rather than the outer dimension. When tightening the wing nut, turn it until the rubber bulges slightly against the pipe wall, ensuring a snug, slip-free fit. Over-tightening can crack older, brittle plastic pool fittings, so hand-tightening with firm pressure is recommended.

These plugs are mandatory for every DIY pool winterization project involving inground plumbing lines. They are not recommended for loose, unthreaded flexible hoses, which should be completely disconnected and stored indoors instead.

Pool Antifreeze – Non-Toxic Splash Pool Antifreeze

Even with a powerful blower, small amounts of water can pool in low spots of underground PVC lines. If this water freezes, it can cause pinpoint fractures that are incredibly difficult to locate and repair. Adding non-toxic pool antifreeze to the lines provides an insurance policy against residual moisture by lowering the freezing point of any remaining water.

Non-Toxic Splash Pool Antifreeze is formulated specifically for pool plumbing systems, offering burst protection down to -50 degrees Fahrenheit. It utilizes a high-purity propylene glycol base that is completely safe for swimmers, pets, and pool liners once the pool is opened in the spring. It will not interfere with pool chemistry or stain plaster finishes.

• Temperature Rating: Burst protection down to -50°F (-45°C)
• Chemical Base: Non-toxic propylene glycol (never use ethylene glycol)
• Capacity: 1-gallon containers
• Compatibility: Safe for copper, PVC, and flexible plastic piping

This antifreeze is designed to be used undiluted for maximum freeze protection; do not mix it with water before pouring. Pour it directly into the skimmer or return lines using a long funnel after the lines have been blown out and plugged. If the line is open to the pool, use a standpipe to ensure the antifreeze remains concentrated inside the plumbing.

This product is highly recommended for pool owners in deep-freeze regions where winter temperatures consistently drop below zero. It is not suitable for automotive use, and conversely, automotive antifreeze must never be used in a pool due to its extreme toxicity.

Cover Seal Wrap – Winter Wrap Blue Pool Cover Seal

For above-ground pools, wind is the ultimate enemy of a winter cover. Howling winter winds can get under the lip of the cover, causing it to flap violently, damage the pool top rails, and eventually blow off entirely. Wrapping the perimeter of the pool with a specialized seal wrap locks the cover down tight against the metal frame.

The Winter Wrap Blue Pool Cover Seal is a high-strength, UV-stabilized stretch film that clings tightly to metal, vinyl, and itself. Unlike standard shipping wrap, this film is engineered to withstand extreme cold without becoming brittle or losing its tack. It acts as a continuous band, sealing the gap between the pool wall and the cover to keep wind and debris out.

• Roll Dimensions: 80-gauge thickness, typically 500 feet long
• Material: Cold-tolerant, UV-resistant stretch polymer
• Color: Blue (helps identify tears or gaps easily)
• Application: Securing above-ground pool covers around the top rail

For a secure hold, apply at least three to four complete wraps around the perimeter of the pool, overlapping each layer by 50%. Ensure the wrap covers both the edge of the winter cover and the metal pool wall directly beneath the top rail. This creates a solid, weather-resistant band that prevents wind from catching the underside of the tarp.

This product is an excellent solution for above-ground pool owners in open, windy geographic areas. It is not designed for inground pools or pools utilizing safety covers anchored to concrete decks.

Leaf Cover Net – Robelle Heavy Duty Leaf Net Cover

Deciduous trees can dump massive amounts of wet, heavy leaves onto a pool cover during late autumn. If left to rot, these leaves turn into a heavy, acidic sludge that is incredibly messy to clean up in the spring. A lightweight leaf net cover catches these leaves, allowing you to peel them off the pool in one easy motion before the winter snow sets in.

The Robelle Heavy Duty Leaf Net Cover is constructed from a durable, woven polyethylene mesh that catches the smallest leaves while allowing water to pass through. It features a generous 4-foot overlap, giving you plenty of material to secure the net over the main winter cover. The reinforced binding and heavy-duty brass grommets ensure the net won’t tear under the weight of wet leaves.

• Material: High-density woven polyethylene mesh
• Overlap: 4-foot extra material for easy securing
• Grommets: Rust-resistant brass grommets spaced every 4 feet
• Fastening: Includes a heavy-duty cable and winch tightener

The critical step with a leaf net is timing its removal. You must pull the leaf net off the pool before the first major freeze or snowfall of the season. If the net becomes frozen into the surface ice sheet, it cannot be removed without tearing the fabric and damaging the main cover beneath it.

This net is a massive time-saver for pool owners with heavily wooded yards, especially those with oak or maple trees. It is not necessary for pools located in open areas with minimal nearby foliage.

Line Blowout Blower – Cyclone Pro Bypass Pool Blower

Blowing the water out of underground lines is the single most important step in winterizing an inground pool. Standard shop vacuums and small air compressors often lack the air volume (CFM) required to push water out of deep main drains and long plumbing runs. A dedicated, commercial-grade pool blower provides the high-volume air output necessary to clear lines quickly and completely.

The Cyclone Pro Bypass Pool Blower is designed specifically for the demanding task of clearing pool plumbing lines. It features a powerful 3.0 horsepower motor that generates up to 160 CFM of air flow at 3 psi. The bypass design protects the motor from overheating when blowing against backpressure, ensuring long-term reliability.

• Motor: 3.0 HP, 120-volt bypass motor
• Performance: 160 CFM of air volume at 3.0 psi
• Hose Connection: 2-inch quick-connect fitting with adapter
• Housing: Rugged, impact-resistant molded plastic casing

To use this blower, connect the discharge hose directly to the skimmer line or the pump basket intake using a threaded adapter. Always ensure that at least one valve or return line is open before turning the blower on to prevent dangerous over-pressurization of the plumbing system. The high volume of air will create a dramatic bubbling effect in the pool, signaling that the line is completely clear of water.

This blower is a wise investment for DIY pool owners who want to avoid renting equipment or paying a professional service every autumn. It is not necessary for small above-ground pools with short, easily disconnected hoses.

How to Clear and Lock Down Plumbing Lines Correctly

Clearing pool plumbing lines is a precise process that requires a systematic approach to prevent water from returning to the pipes. Always start by lowering the pool water level below the skimmer mouth and return jets, according to your specific cover manufacturer’s guidelines. Once the water level is set, connect the blowout blower to the main line at the filter pump deck.

[Blower Connection]         │        ├──► [Skimmer Line] ──► (Blow until dry) ──► [Install Gizzmo]        │        ├──► [Return Jets]  ──► (Blow until dry) ──► [Install Rubber Plugs]        │        └──► [Main Drain]   ──► (Blow until bubbling) ──► [Close Valve to Air-Lock] 

To clear the plumbing lines systematically, follow this step-by-step sequence:

1. Isolate the Lines: Use the multi-port valve and individual line valves to direct all air pressure to one line at a time, starting with the line closest to the pump.
2. Blow the Skimmers: Force air through the skimmer line until a dry mist blows out, then quickly thread in the Teflon-taped Gizzmo.
3. Clear the Return Lines: Direct air to the return lines; once water clears and air bubbles vigorously, insert the expansion plug and tighten the wing nut firmly.
4. Air-Lock the Main Drain: Send air down to the deep main drain until massive bubbles break the pool surface. Quickly close the slide valve at the pump pad to create an “air lock,” keeping water from climbing back up the pipe.

Always double-check every rubber plug after installation by applying a small amount of soapy water around the edge. If bubbles appear, the plug is leaking air and must be adjusted or replaced immediately. Taking the time to execute this sequence correctly ensures your plumbing remains dry and safe, even during the deepest winter freezes.

Summary of Winterizing Essentials

Equipment	Primary Function	Key Feature to Look For
Safety Cover	Debris & weight protection	Flush brass anchors, double-webbing
Air Pillow	Absorbs ice expansion	Heavy-gauge vinyl, 4×15 dimension
Winter Kit	Algae & stain prevention	Slow-release sanitizing floater
Cover Pump	Standing water removal	Automatic water-sensing switch
Skimmer Guard	Protects skimmer throat	Collapsible body, dual-thread design
Expansion Plugs	Seals plumbing lines	Non-corrosive stainless hardware
Pool Antifreeze	Line freeze protection	Non-toxic propylene glycol base
Cover Seal Wrap	Wind damage prevention	UV-stabilized stretch polymer
Leaf Cover Net	Debris management	Fine mesh with generous overlap
Line Blower	Water displacement	3.0 HP bypass motor, high CFM

Prepared for the Big Freeze

Protecting your pool from freezing temperatures is all about using the right gear and paying close attention to detail. By choosing durable safety covers, heavy-duty plugs, and reliable blowouts, you can prevent expensive structural damage. When spring arrives, your pool will be ready to open quickly, saving you time, money, and hassle.