8 Essential Winterizing Kits for Your Inground Pool

As autumn leaves start to drop and the backyard breeze turns crisp, the reality of closing your inground pool for the season becomes impossible to ignore. Skipping out on proper closing steps might save a few hours in October, but it invites a nightmare of cracked pipes, torn liners, and green swamp water come spring. Equipping your pool with the right winterizing gear ensures that your backyard oasis survives the freezing months completely unscathed and ready for next year’s first splash.

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Why Proper Inground Pool Winterizing Matters

Water expands by about nine percent when it freezes, exerting immense pressure on anything containing it. In an inground pool, this expansion can easily crack thick PVC underground pipes, shatter plastic skimmer wells, and tear heavy-duty vinyl liners. Protecting these vulnerable components is not just about keeping the water clean; it is about preventing thousands of dollars in structural damage.

Algae and bacteria do not completely vanish just because the temperature drops. Without a dedicated chemical barrier, late autumn warmth and early spring sun will turn a neglected pool into a thriving biological soup long before opening day. Managing the chemical balance during the off-season ensures a clear, hassle-free opening that saves time, effort, and money on shock treatments.

Debris management is another critical factor that pool owners often underestimate during the winter months. Heavy snow, rotting leaves, and windblown twigs do more than just stain pool surfaces; they can overload covers and cause structural collapses if left unchecked. Proper winterizing establishes a secure, balanced system that handles the worst winter weather without demanding constant hands-on maintenance.

What to Do Before Installing Your Winter Cover

Long before the cover is rolled out across the deck, the pool water must be thoroughly cleaned and balanced. Vacuum the pool floor to remove all organic matter, brush the walls to dislodge stubborn algae spores, and skim the surface completely. Any organic debris left behind will decay over the winter, consuming your sanitizer and leaving tough stains on the pool liner or plaster.

Adjusting the water chemistry is the next vital phase, targeting pH, total alkalinity, and calcium hardness. Aim for a pH level between 7.2 and 7.6, alkalinity between 80 and 120 ppm, and calcium hardness around 200 to 400 ppm. Balancing these parameters prevents scale buildup on pool surfaces and protects metal fixtures from corrosive winter water.

Finally, lower the water level to the appropriate height based on the type of cover being used. Solid covers usually require the water to be lowered 3 to 6 inches below the skimmer, while mesh safety covers require a drop of 12 to 18 inches. Lowering the water prevents freezing water from expanding into the skimmer throat and damaging the tile line.

Winter Chemical Kit – In The Swim Ultimate Kit

A dedicated winter chemical kit slow-releases sanitizers and stain preventers throughout the long, cold off-season to keep water pristine. Without this continuous chemical defense, algae spores will colonize the pool as soon as the water temperature rises above 40 degrees Fahrenheit in early spring. The In The Swim Ultimate Kit provides a comprehensive, pre-measured chemical assault that works silently under the cover.

This kit stands out because it features a non-chlorine winter shock that won’t bleach or damage vinyl liners, alongside a powerful winterizer algaecide designed for low-temperature performance. It also includes a patented slow-release chemical dispenser that floats in the water, distributing sanitizing agents evenly over several months. Additionally, a specialized metal chelating agent prevents rust and mineral scaling on pool walls.

• Kit Sizes Available: Up to 10,000 gallons, 20,000 gallons, and 35,000 gallons
• Included Components: Winterizer algaecide, non-chlorine shock, metal-free stain preventer, and a slow-release winter floater
• Compatible Pool Types: Vinyl, fiberglass, plaster, and concrete inground pools

Before deploying the kit, ensure the water temperature has dropped consistently below 60 degrees Fahrenheit to prevent the chemicals from degrading too quickly. This kit is ideal for homeowners who want an all-in-one chemical solution without the guesswork of buying separate bottles. It is not suitable for pools that will remain uncovered or active during the winter, as the floating dispenser relies on still, covered water to function properly.

Safety Pool Cover – Meyco Lite Solid Safety Cover

A high-quality safety cover serves a dual purpose: it blocks harsh winter debris from entering the pool and acts as a life-saving barrier for children and pets. Standard tarp-style covers can easily sag under heavy snow loads, creating a drowning hazard of pooled water on top. The Meyco Lite Solid Safety Cover addresses both issues by anchoring securely into the pool deck, creating a taut trampoline-like surface.

Crafted from a lightweight, high-tensile solid vinyl fabric, this cover blocks 100 percent of sunlight to eliminate off-season algae growth while remaining remarkably easy to handle during installation and removal. It features heavy-duty brass anchors and stainless steel springs that tolerate extreme tension without warping. The integrated micro-mesh drain strip down the center allows rainwater to filter through while keeping fine silt and organic material out.

• Material: 18-oz heavy-duty Meycolite solid vinyl-mesh hybrid
• Hardware: Flush-mount brass anchors and heavy-duty tension springs
• Sizing Options: Custom fit sizes ranging from standard 12’x24′ to 30’x50′ rectangles and freeform shapes
• Break Strength: Exceeds ASTM safety standards for weight load limits

Installing this cover requires drilling anchor holes directly into a concrete, stone, or wood deck, which requires a rotary hammer drill and careful measurement. This premium cover is best for pool owners seeking maximum safety, clean spring water, and a neat backyard appearance. It is not the right choice for budget-focused users who prefer a simple drop-in tarp cover or those without a solid deck surface to anchor into.

Skimmer Guard – Gizzmo Ultra Freeze Protection

The skimmer is one of the most vulnerable and expensive-to-repair parts of an inground pool. When water gets trapped in the skimmer well and freezes, it expands outward, easily cracking the plastic housing and causing underground leaks. The Gizzmo Ultra Freeze Protection acts as a sacrificial expansion chamber, absorbing the destructive pressure of freezing water so your skimmer doesn’t have to.

This heavy-duty plastic tube features a built-in blowout channel that allows you to clear the plumbing line with a compressor without removing the device. The Gizzmo is engineered to collapse inward under the crushing force of ice, neutralizing the outward pressure inside the skimmer throat. It features deep-cut male threads that seal securely into standard 1.5-inch or 2-inch pool return lines.

• Thread Sizes: Dual-threaded for 1.5-inch and 2-inch skimmer ports
• Length: 16 inches for deep skimmer wells
• Material: High-density, crushable polyethylene
• Feature: Integrated air blowout channel with a heavy-duty cap

Make sure to wrap the threads with Teflon tape before screwing the Gizzmo into place to ensure an airtight and watertight seal. This tool is a must-have for pool owners in climates that experience hard freezes and deep winter snows. It is unnecessary for pools in mild southern climates where water temperatures never drop low enough to freeze solid.

Winter Expansion Plugs – Premium Pool Rubber Plugs

After clearing the pool’s plumbing lines of water, keeping them empty is the next critical task. Water can easily seep back into the return lines from the pool, leading to freeze damage deep beneath the ground. Premium Pool Rubber Plugs seal these open ports completely, preventing water from re-entering the winterized plumbing network.

These plugs feature a heavy-duty tapered rubber body wrapped around a corrosion-resistant stainless steel bolt and wing nut. As you tighten the wing nut, the rubber expands outward, forming a completely airtight and watertight seal inside the pipe. The non-corrosive hardware ensures that the plugs can be easily removed in the spring without rusting or seizing inside the returns.

• Available Sizes: #00 (1/2″) through #14 (4″) outer diameter
• Hardware Material: Marine-grade stainless steel bolt and nylon wing nut
• Plug Material: Premium ribbed neoprene rubber
• Application: Pool return inlets, cleaner lines, and skimmer ports

Be sure to measure the inner diameter of your return lines accurately, as a plug that is too small will blow out under pressure, while one that is too large won’t insert deep enough to seal. These expansion plugs are perfect for anyone winterizing an inground pool with standard return lines and suction ports. They are not suitable for threaded returns unless you use the correct thread-compatible threaded plugs instead of expanding rubber ones.

Pool Cover Pump – Little Giant APCP-1700 Pump

Rainwater and melting snow quickly accumulate on solid pool covers, creating massive weight loads that can stretch, tear, or pull the cover completely into the pool. This stagnant water also acts as a breeding ground for pests and collects fine dirt that is difficult to clean. A reliable pool cover pump, like the Little Giant APCP-1700 Pump, automatically clears this accumulation before it becomes a hazard.

This submersible pump features an automatic mechanical float switch that activates when water levels reach two inches and shuts off when the water drops to less than an inch. Delivering a flow rate of up to 1,700 gallons per hour, it quickly evacuates heavy downpours using standard garden hose connections. The wide, weighted base prevents the pump from tipping over on uneven cover surfaces, keeping it oriented correctly at all times.

• Flow Rate: 1,700 GPH at 0 feet of head pressure
• Power Cord Length: 25 feet, heavy-duty grounded cord
• Discharge Connection: Standard 3/4″ garden hose adapter
• Activation Point: Turns on at 2 inches, turns off at 0.75 inches of water depth

Keep the intake screen clear of rotting leaves and twigs, as blockages will cause the motor to overheat and shut down prematurely. This pump is an essential investment for anyone using a solid safety cover or a standard tarp cover. It is not necessary for pool owners who use mesh safety covers, as water drains directly through those covers into the pool below.

Pool Air Pillow – Robelle Ice Equalizer Pillow

When ice forms on the surface of a covered pool, it expands outward, exerting immense pressure against the pool walls and the tile line. This lateral pressure can easily crack plaster, warp steel walls, and damage vinyl liners. Placing a Robelle Ice Equalizer Pillow beneath the cover absorbs this expansion, forcing the ice to expand inward toward the pillow instead of outward against the pool’s structure.

Built from heavy-duty 16-gauge vinyl, this rugged air pillow is designed to withstand freezing temperatures without cracking or leaking air. It features a secure leaf valve that locks air inside, preventing the slow deflation that common cheap inflatables suffer from over the winter. The outer edges feature reinforced grommet holes for tying the pillow securely in the center of the pool.

• Dimensions: Available in 4’x4′, 4’x8′, and 4’x15′ sizes
• Material: Cold-resistant 16-gauge PVC vinyl
• Valve Type: Secure dual-seal leaf valve
• Tie-Down Points: Four corner grommets for balanced positioning

Only inflate the pillow to about 60 to 70 percent of its capacity; leaving some give prevents the expanding ice from popping the pillow like a balloon. This tool is highly recommended for vinyl liner and steel-walled inground pools in areas subject to thick surface freezes. It is less critical for concrete pools in mild areas where ice sheet formation is rare and thin.

Cover Water Tubes – Swimline Double Chamber Tubes

For pool owners using traditional solid winter tarps, keeping the edges of the cover weighted down is crucial to prevent the wind from lifting the cover and carrying it away. Bricks, concrete blocks, and timber can easily tear the vinyl cover or damage the pool deck if shifted by the wind. Swimline Double Chamber Tubes provide a soft, heavy, and secure anchor system that sits flat along the pool perimeter without causing damage.

These tubes feature a double-chamber configuration that prevents them from rolling out of place on sloped pool decks or in high winds. Constructed from heavy-duty 18-gauge vinyl, they are built to resist puncture from frozen debris and withstand the expansion of freezing water inside them. The wide fill valves make filling them with a garden hose quick and easy, while the secure caps prevent leaks during the winter.

• Lengths Available: 8-foot and 10-foot options
• Material Thickness: Durable 18-gauge vinyl construction
• Design: Double-chamber anti-roll design
• Valves: Heavy-duty leak-proof leak caps

Do not fill these water tubes completely to the top; leave at least one-third of the tube empty to allow room for the water to expand when it freezes. These water tubes are ideal for owners of rectangular or freeform pools utilizing a standard non-anchored tarp cover. They are completely unnecessary for pool owners who have installed an anchored spring-tension safety cover system.

Pool Leaf Net – Blue Wave Bronze Inground Cover

Falling autumn leaves can quickly turn the top of your winter cover into a heavy, rotting mass of organic sludge that is incredibly difficult to remove in the spring. If you pull the cover off with this debris still on it, you risk dumping a winter’s worth of decay directly into your clean pool water. The Blue Wave Bronze Inground Cover acts as a lightweight leaf net that sits on top of your main cover, catching debris for easy removal.

Constructed from a durable woven polyethylene mesh, this net allows water to pass through freely while capturing even the smallest leaves and twigs. Once the trees have finished shedding in late autumn, you simply lift the leaf net off, leaving your main cover pristine for the rest of the winter. It features a generous four-foot overlap that ensures complete coverage over the edges of your pool, preventing leaves from blowing underneath.

• Material: Heavy-duty woven polyethylene monofilament
• Pool Sizes Covered: Fits pools from 12’x24′ up to 30’x50′
• Overlap: 4-foot overlap to accommodate water levels and deck anchoring
• Color: Forest Green/Black for low visibility

Ensure the net is securely weighted down with water tubes or anchored along the perimeter, as strong winds can lift an unweighted mesh cover. This leaf net is an excellent choice for pool owners with heavy tree canopies surrounding their backyard. It is not necessary for pool owners who live in open areas with minimal autumn foliage.

How to Clear and Blow Out Your Pool Plumbing Lines

Blowing out the plumbing lines is arguably the most critical step in protecting an inground pool from freeze damage. Any water left inside the underground PVC pipes will freeze, expand, and rupture the lines, requiring excavation and thousands of dollars in repairs to fix. Using a high-volume air blower or a heavy-duty shop vacuum connected to the pump lines is the most effective way to push water out of the entire filtration system.

Start by setting the pool multi-port valve to the “recirculate” position to bypass the filter tank entirely. Connect your air source to the pump basket drain plug or the skimmer line, and turn it on to force air through the return lines until you see a steady stream of bubbles emerging in the pool. Once the line is cleared and bubbling like a geyser, slide your rubber expansion plugs into the return ports and tighten them down immediately while the air is still blowing.

Next, switch the air flow toward the skimmer lines and main drain, allowing the air to push the water levels down below the frost line. If your pool has a main drain at the bottom of the deep end, let it bubble for a few minutes to create an air lock, then close the slide valve at the equipment pad to trap that air inside. This air lock prevents water from creeping back up the pipe, keeping it safe from freezing temperatures deep underground.

Best Practices for Storing Pool Gear Until Spring

The way you store your pool equipment during the winter dictates how long it will last and how smoothly your spring opening will go. Before packing away your ladder, steps, handrails, and cleaning tools, wash them down with clean freshwater to remove chlorine residue and scale. Allow every item to dry completely in the sun, as storing damp gear invites mold, mildew, and corrosion over the winter.

Place all rubber gaskets, O-rings, and pump basket plugs into a labeled, sealable storage bag so they do not get lost during the off-season. Apply a light coating of silicone-based lubricant to the rubber seals to keep them from drying out, cracking, and losing their elasticity before spring. Store these small parts inside your garage or a climate-controlled shed to protect them from extreme temperature fluctuations.

For larger items like chlorinating units, robotic pool cleaners, and solar covers, store them off the ground in a dry, rodent-proof area. Mice and other pests love to nest inside stored pool covers and chew through vinyl, leaving behind holes that are difficult to patch. Keeping your gear elevated, dry, and sealed ensures that everything is in perfect working order when the warm weather returns.

Conclusion

Spending the time to properly winterize your inground pool with high-quality gear is the ultimate insurance policy for your backyard investment. By sealing the plumbing lines, balancing the chemicals, and securing a heavy-duty cover, you safeguard your pool against the harshest elements winter can throw at it. When the spring sun finally breaks through, you will reap the rewards with a crystal-clear, damage-free pool that is ready for another season of fun.