Essential Pool Closing Supplies & Winterizing Equipment

As autumn leaves start to fall and the summer heat fades, backyard pool owners face the inevitable task of closing up their swimming oasis for the cold months. Skipping steps or using subpar gear now guarantees a spring headache filled with green algae, cracked pipes, and costly repairs. Securing the right winterizing equipment is the single best way to protect your investment and ensure a stress-free reopening next summer.

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Why Proper Pool Winterization Saves Money and Stress

Leaving a pool exposed to freezing temperatures without proper preparation is a recipe for catastrophic damage. Water expands by about nine percent when it freezes, exerting immense pressure on pipes, pumps, and pool walls. If you fail to protect these components, you face cracked plumbing lines buried deep underground and ruined filtration equipment that costs thousands of dollars to replace.

Beyond mechanical protection, a methodical winterization keeps organic debris out of your water. Left uncovered or poorly sealed, a pool becomes a collection basin for dead leaves, dirt, and melting snow, which fuel massive algae blooms under the early spring sun. Investing a bit of time and money in high-quality closing gear saves you from expensive chemical rescue jobs and grueling scrubbing sessions come May.

A successful close isn’t just about throwing a tarp over the top; it is a systematic process of chemical balancing, line clearing, and physical protection. Each piece of equipment serves a specific purpose in fighting back against sub-zero temperatures, heavy snow loads, and wind. Getting the right gear now means you can rest easy during the harshest winter storms, knowing your backyard retreat is completely safe.

Winter Cover – Robelle Premium Solid Winter Cover

The winter cover is your pool’s primary shield against the elements, keeping out sunlight, leaves, wind-blown dirt, and precipitation. Without a solid barrier, sunlight penetrates the water, warming it just enough to trigger algae growth even in cold weather. It also prevents heavy debris from decaying in the water, which stains liners and overloads the filtration system upon reopening.

The Robelle Premium Solid Winter Cover stands out due to its heavy-duty polyethylene construction and a dense 12×12 scrim count that resists tearing under heavy snow loads. It features a topside coated with UV-resistant inhibitors to prevent degrading under constant sun exposure, while the black underside prevents light from fueling algae growth. The heavy-duty binding and secure grommets ensure it stays anchored even when winter winds howl across the yard.

When purchasing, do not buy a cover that matches your pool’s exact water dimensions; always select a size that includes a 4-foot overlap for in-ground pools to account for the water level drop. Keep in mind that solid covers require water bags or a winch-and-cable system to stay secured, and they will collect standing water that must be pumped off periodically.

This cover is ideal for: * Pool owners in areas with heavy leaf fall and harsh, snowy winters * Those looking for a complete light block to prevent springtime algae blooms

It is not suitable for owners with safety-cover anchor systems who require a tension-tight mesh cover that supports weight.

Cover Pump – Wayne WAPC250 Pool Cover Pump

Rainwater and melting snow quickly accumulate on top of a solid pool cover, creating a heavy pool of water that can stress the cover’s seams and pull it into the pool. This stagnant water also attracts pests and collects decomposing organic matter, making cover removal a messy nightmare in the spring. A reliable cover pump automatically removes this water, protecting the cover’s integrity and keeping the weight manageable.

The Wayne WAPC250 Pool Cover Pump is a top-tier choice because of its intelligent, freeze-protection technology and automatic sensor. It detects water levels and turns on automatically when water reaches 2 inches, then shuts off when the surface is clear down to 0.5 inches. With a flow rate of up to 3,000 gallons per hour, it clears water rapidly before it can freeze into a destructive sheet of ice.

This pump features a bottom strainer design that filters out debris, preventing clogs from leaves and twigs that inevitably land on the cover. However, users should regularly check the intake to ensure leaves haven’t completely blocked the suction holes during heavy autumn drops. It uses a standard garden hose connection, but using a high-flow, kink-resistant hose maximizes its drainage speed.

This pump is best for: * Homeowners in regions with heavy winter rain or high snowfall accumulation * Anyone who wants a “set-and-forget” automated solution to prevent cover collapse

It is unnecessary for those utilizing tight, permeable mesh safety covers that allow water to drain directly into the pool.

Winterizing Kit – In The Swim Ultimate Closing Kit

Closing a pool with balanced water is only half the battle; you need specialized, slow-release chemicals to preserve water quality over months of stagnation. A dedicated winterizing kit provides a concentrated defense system that prevents stains, controls algae, and keeps the water clear until spring. Without these targeted winter chemicals, you will open your pool to a murky, foul-smelling swamp.

The In The Swim Ultimate Closing Kit is a pre-measured, highly effective chemical bundle designed specifically for off-season preservation. It contains a powerful winter shock, a long-lasting copper-free algaecide, rust and scale metal inhibitors, and a unique slow-release winter floater filled with non-chlorine sanitizer. This combination ensures your liner remains stain-free and your water stays clean without bleaching or damaging pool surfaces.

Kits are sized based on total pool volume, so it is critical to calculate your pool’s gallon capacity accurately before purchasing. The chemicals must be fully circulated throughout the pool for at least several hours before you lower the water level and shut off the pump. Always add the chemicals in the specific order recommended by the manufacturer to prevent chemical neutralization or cloudiness.

This kit is perfect for: * Pool owners wanting a convenient, all-in-one chemical solution without guessing dosages * All pool types, including vinyl liner, fiberglass, and plaster finishes

It is not recommended for those who prefer to custom-blend their own chemical regimens using raw bulk chemicals.

Pool Pillow – Swimline Blue Wave 4×4 Foot Pillow

For above-ground pools, ice formation is a major threat to structural integrity. When water freezes into a solid sheet, it expands outward, pushing against the pool walls and putting immense pressure on the frame and liner. An air pillow, placed in the center of the pool beneath the cover, acts as a compression cushion that absorbs this ice expansion, forcing the ice to expand inward instead of outward.

The Swimline Blue Wave 4×4 Foot Pillow is built from heavy-duty 16-gauge vinyl, designed specifically to withstand the brutal crushing forces of expanding ice sheets. It features a reliable leak-proof valve that prevents air loss over months of exposure to sub-zero temperatures. At four feet square, it provides the ideal surface area to create the necessary surface tension break on mid-to-large-sized above-ground pools.

A common mistake is inflating the pillow to its absolute maximum capacity; instead, inflate it to only 60% to 80% full so it remains pliable enough to absorb compression without popping. Secure the pillow in the exact center of the pool using ropes tied to the corner grommets, ensuring it does not drift to one side before the cover is pulled tight.

This product is essential for: * Above-ground pool owners in climates that experience consistent, hard freezing temperatures

It is generally not required for in-ground pools, where ice expansion is managed differently, though some in-ground owners use them to shed water toward the cover edges.

Expansion Plugs – Hayward SP1022C Rubber Plug

Once you blow the water out of your pool plumbing lines, you must seal them completely to prevent water from seeping back in and freezing. Expansion plugs slip into return jets and cleaner lines, creating an airtight and watertight seal inside the pipe opening. Without these plugs, water will re-enter the lines, freeze, and crack the underground PVC piping, leading to incredibly costly excavation repairs.

The Hayward SP1022C Rubber Plug features a heavy-duty, industrial-grade rubber body that compresses evenly when the wing nut is tightened. The non-corrosive stainless steel bolt and wing nut assembly resist rust and degradation from pool chemicals and moisture. This design provides a reliable, high-pressure seal that will not slip or pop out under pressure when the ground freezes and shifts.

Expansion plugs come in several sizes, with the 1.5-inch size being the standard for most residential pool return lines. It is vital to measure your specific return fittings and skimmer ports before buying to ensure a snug fit. Before inserting the plug, inspect the rubber sleeve for cracks or dry rot from previous seasons, and replace any plug that shows signs of hardening.

This plug is designed for: * Pool owners needing to seal standard threaded or smooth 1.5-inch return lines and cleaner ports

It is not suitable for oversized commercial pipes or lines with highly specialized, non-standard custom fittings that require threaded male plugs.

Skimmer Guard – Gizzmo Ultra Freeze Protection

The pool skimmer is particularly vulnerable to freeze damage because it sits right at the water line and is exposed to the elements on multiple sides. If water enters the skimmer throat and freezes, the expanding ice will easily crack the plastic skimmer housing, requiring a major reconstruction job to fix. A skimmer guard is designed to absorb this expansion pressure, protecting the delicate plastic housing from splitting.

The Gizzmo Ultra Freeze Protection is the industry standard for skimmer safety because of its unique, hollow, compressible plastic design. It features a heavy-duty male thread at the bottom that screws directly into the skimmer’s plumbing line, sealing the pipe while simultaneously acting as an expansion absorber in the skimmer well. The Ultra model is specifically engineered with a built-in blow-out channel, allowing you to clear the line without removing the device.

The Gizzmo is available in different lengths and thread sizes, with the 16-inch length and 1.5-inch thread fitting most standard deep-well skimmers. Ensure you apply Teflon tape to the threads before screwing it in to guarantee an airtight seal. If your pool has a shallow skimmer, measure carefully to ensure the Gizzmo does not sit too high, preventing your winter cover from laying flat.

This device is perfect for: * In-ground pool owners with standard 1.5-inch or 2-inch skimmer lines in freezing climates

It is not necessary for pool owners in tropical climates who do not experience freezing temperatures, nor is it designed for specialized wall-mounted above-ground skimmers that are completely drained and removed.

Line Blower – Cyclone Pro Swimming Pool Blower

Getting every drop of water out of your underground pool plumbing is the single most critical step in winterization. Normal shop vacs often lack the air volume and pressure needed to push water through long pipe runs and deep main drains. A dedicated line blower delivers the high-volume, high-velocity air stream required to clear the lines completely, leaving them dry and safe from frost heave.

The Cyclone Pro Swimming Pool Blower is the gold standard for pool professionals and DIYers alike, powered by a rugged 3.0 HP motor that generates massive bypass air flow. It creates up to 130 cubic feet of air per minute (CFM), which is strong enough to blow out lines even in pools with deep main drains and complex plumbing manifolds. The durable plastic housing resists impact, and the motor features thermal protection to prevent overheating during extended use.

Using the Cyclone Pro requires a proper connection hose, typically a heavy-duty 1.5-inch flexible hose with a threaded adapter that attaches securely to your skimmer or pump basket. Always ensure at least one return line or main drain valve is open before turning the blower on to prevent dangerous pressure build-up in your plumbing system.

This heavy-duty blower is ideal for: * Serious DIY pool owners with complex in-ground plumbing systems, multiple returns, and deep main drains

It is overkill for basic, small above-ground pools with short, simple hoses that can easily be disconnected and drained by hand.

Pool Antifreeze – Splash Non-Toxic Antifreeze

Even after blowing out your pool plumbing, small pockets of water can migrate and collect in low spots of the underground pipes. Pool antifreeze provides a critical secondary layer of protection by lowering the freezing point of any residual water, preventing it from expanding and cracking the pipes. It is added directly to plumbing lines and skimmers once they have been blown out and plugged.

Splash Non-Toxic Antifreeze is formulated specifically for swimming pool plumbing, utilizing a high-purity propylene glycol base that is completely non-toxic and biodegradable. Unlike automotive antifreeze, which is highly toxic ethylene glycol, this formula is safe for your pool liner, plumbing, and eventual contact with swimmers upon spring reopening. It provides burst protection down to -50 degrees Fahrenheit, ensuring total safety in the deepest winter freezes.

Never use automotive antifreeze in your pool system, as it will ruin pool seals and pose a severe health hazard when you reopen. To apply, use a funnel to pour the antifreeze directly into the plumbing lines before sealing them with expansion plugs, typically using one gallon per 10 to 15 feet of pipe.

This product is essential for: * In-ground pool owners in extreme winter regions where deep ground frost occurs

It is not needed for above-ground pool plumbing that is completely disconnected, dried, and stored indoors for the winter.

Water Bags – Robelle Double Chamber Water Tubes

For in-ground pools using solid covers, keeping the cover firmly anchored against the pool deck is essential to prevent wind from getting underneath and lifting it. Water bags are heavy, water-filled vinyl tubes placed around the perimeter of the cover to weigh it down securely. They conform to the shape of the deck and cover, preventing leaves and debris from blowing under the edges while keeping the cover taut.

The Robelle Double Chamber Water Tubes are superior to single-chamber bags because their dual-tube design prevents them from rolling off the pool deck when filled. Made from heavy-duty, puncture-resistant 18-gauge vinyl, they are built to withstand freezing temperatures without cracking. The leak-proof valves are easy to fill with a garden hose and seal tightly to prevent water loss throughout the winter.

When filling water bags, only fill them to about half to three-quarters full to allow room for the water inside to expand as it freezes into solid ice. Space the bags closely around the perimeter of the pool cover, leaving no large gaps where wind could get underneath and lift the cover.

These water bags are perfect for: * In-ground pool owners using standard solid covers without built-in brass deck anchors

They are completely unnecessary for pools utilizing spring-tensioned safety covers that anchor directly into the concrete deck.

Step-by-Step Checklist for Clearing Pool Lines

Clearing your pool lines is a precise mechanical sequence that must be executed carefully to ensure no water remains in the underground pipes. Start by lowering the pool water level to about 4 to 6 inches below the skimmer mouth (or below the returns if you are not using expansion plugs). Next, hook up your line blower to the pump basket or the skimmer line, ensuring the pool multi-port valve is set to the “Recirculate” or “Closed” position depending on your setup.

Turn on the blower and begin clearing the lines one by one, starting with the return line closest to the pump and working your way to the furthest. As a torrent of air and water blasts out of a return jet, quickly insert an expansion plug and tighten the wing nut until it is completely sealed. Repeat this process for each return line until only air is escaping, indicating the line is entirely dry.

For the main drain, open the valve and let the blower run until you see a massive geyser of air bubbles erupting from the bottom of the pool. Immediately close the valve at the pump manifold to create an air lock, which prevents water from rising back up into the pipe. Finally, pour a gallon of non-toxic pool antifreeze down the skimmer line, insert your skimmer guard, and secure the final plug.

How to Store Pool Equipment Safe from Winter Frost

Leaving your pool pump, filter, and chlorinator exposed to freezing temperatures and moisture over the winter will significantly shorten their lifespans. Start by opening the drain plugs on your pump housing, filter tank, and heater to let all standing water drain out completely. If water remains inside these heavy plastic and metal castings, it will freeze, expand, and crack the expensive housings, rendering them useless.

Once fully drained, store smaller, sensitive equipment like pump motors, pressure gauges, automatic chlorinating units, and salt cells indoors in a climate-controlled area like a basement or heated garage. Keeping these components away from freezing temperatures prevents delicate seals, o-rings, and electronic circuit boards from drying out and cracking. If you must leave the filter tank outside, cover it with a heavy-duty waterproof tarp to protect it from direct snow and ice accumulation.

Do not forget about accessory equipment like pool ladders, step systems, chemical feeders, and cleaning hoses. Wash them down with clean fresh water to remove chlorine and organic residue, allow them to dry thoroughly, and store them in a shed or garage. Leaving vinyl hoses or plastic ladders outside in freezing weather makes them highly brittle, leading to cracks and failures the moment they are put back into service next spring.

Conclusion

Taking the time to winterize your pool with the right specialized equipment is an investment that pays off in structural longevity and a painless spring opening. By securing high-quality covers, blowers, and plugs, you protect your backyard oasis from the destructive power of winter freeze. When the warm weather returns, you will reap the rewards of your diligence with crystal-clear water and fully operational equipment.