How To Close My Above Ground Pool Like A Professional
Closing your above ground pool properly prevents algae blooms, safeguards your liner from ice damage, and protects expensive pool equipment during freezing winter months. By balancing water chemistry, dropping water levels safely, and winterizing your pump and filter, you guarantee a crystal-clear reopening next spring.
Pre-Winter Preparation and Equipment Checklist
Successfully winterizing an above ground pool requires meticulous planning, precise chemical adjustments, and specialized winter gear to withstand months of sub-freezing temperatures. Skipping foundational steps—such as leaving organic debris in the water or failing to purge plumbing lines—inevitably leads to cracked pipes, warped walls, and a severe swamp-like mess when spring arrives.
- Essential Gear and Tools: Heavy-duty winter pool cover, cable and winch kit, air pillow, heavy-duty cover clips, pool brush, vacuum, skimmer plate cover, non-toxic propylene glycol antifreeze, and winterizing chemical kit (shock, algaecide, slow-dissolving winter floater).
- Mandatory Prerequisites: Water chemistry must be fully balanced, pool walls and floor must be thoroughly brushed and vacuumed, and ambient daytime air temperatures should consistently drop below 65 degrees Fahrenheit to prevent algae growth after chemical application.
- Budget and Duration Benchmarks: Expect to invest between one hundred and three hundred dollars for chemicals, covers, and accessories if replacing worn-out components. Allocate three to four hours of continuous labor to complete the entire closing sequence correctly.
Step-by-Step Above Ground Pool Winterization Process
Step 1: Deep Clean and Balance Water Chemistry
Begin by thoroughly brushing the pool walls and floor to dislodge microscopic algae and organic films, then vacuum the pool to waste to eliminate settled debris. Test the water parameters and adjust total alkalinity to between 80 and 120 parts per million, pH to between 7.2 and 7.6, and calcium hardness to between 175 and 250 parts per million.
Pro-Tip: Introduce a heavy dose of non-chlorine shock or specialized winter shock directly into the water at least 48 hours before adding winter algaecide to prevent chemical binding and staining on your vinyl liner.
Step 2: Lower the Water Level
Adjust your above ground pool water level based on the specific type of skimmer and winter cover system you use. For standard through-wall skimmers, drain the water level down to approximately four to six inches below the skimmer mouth to prevent freezing water from cracking the plastic housing. If you are using a solid winter cover that rests on the water surface or a specialized skimmer closure plate, follow manufacturer guidelines, which often require maintaining a higher water level to support the weight of winter precipitation.
Warning: Never drain an above ground pool completely. Leaving the pool empty during winter destroys the structural integrity of the vinyl liner as it shrinks, and underground hydrostatic pressure can pop or buckle the pool frame.
Step 3: Drain and Store Filtration Equipment
Disconnect the pump, filter system, and chlorinator from the pool plumbing. Unscrew the drain plugs located at the bottom of the pump strainer housing and filter tank to completely empty all trapped water, preventing internal ice expansion that cracks plastic housings. Remove pressure gauges, store them indoors, and place all hoses, pumps, and cartridge filters in a dry, frost-free shed or basement for the winter.
Step 4: Blow Out and Plug Return Lines
Use a shop vacuum or pool blower to force remaining water out of the return lines, starting from the equipment pad and pushing toward the pool interior. Once air bubbles forcefully through the return fitting inside the pool, thread an expansion plug coated with thread sealant tightly into the return jet. Screw a winter threaded plug into the open end from the inside or outside of the pool, and install a Gizzmo or skimmer ice compensator into the skimmer throat to absorb ice expansion forces if water enters the skimmer body.
Step 5: Install Winter Chemicals and Air Pillow
Pour a concentrated winterizing algaecide and enzyme treatment around the perimeter of the pool to inhibit winter-long organic growth. Inflate a heavy-duty vinyl air pillow to approximately sixty percent capacity and tie it securely to the center of the pool using nylon rope attached to the pool top rails; this pillow absorbs the crushing pressure of expanding surface ice. Drape your heavy-duty winter cover evenly over the pool surface, pull the cable tight through the grommets using the winch, and secure cover clips around the top ledges to prevent wind from catching and tearing the material.
How To Close An Intex Above-Ground Pool For The Winter — Peony Street
Above Ground Pool Winterization Method Comparison
| Parameter | Traditional Standard Closing | Full Air-Lock Blowout Method | Minimalist Cover-Only Method |
|---|---|---|---|
| Equipment Safety | Moderate (hoses disconnected) | High (lines blown and plugged) | Low (freezing risks present) |
| Chemical Longevity | High (uses specialized winter kit) | High (comprehensive dosing) | Low (standard closing chemicals) |
| Labor Intensity | Medium (3 to 4 hours) | High (4 to 5 hours) | Low (1 to 2 hours) |
| Spring Reopening Ease | Moderate (clear water expected) | Excellent (pristine water preservation) | Poor (heavy algae remediation needed) |
Common Site Failures and Field Fixes
- Root Cause: Winter cover blows off or sags deeply into the water during heavy wind and snow storms. Actionable Fix: Replace worn-out plastic cable winches, tighten the perimeter steel cable securely, and install heavy-duty polyethylene cover clips every two feet along the top rail. Pump accumulated rain and melting snow off the top of the cover regularly using a submersible cover pump.
- Root Cause: Green, swampy water and heavy algae growth upon spring opening. Actionable Fix: The winterizing algaecide dissipated prematurely due to high initial water temperatures during closing. Shock the pool immediately upon opening with a double dose of liquid chlorine, run the filtration system 24 hours a day, and use a flocculant to drop suspended organic particles to the floor for vacuuming.
- Root Cause: Skimmer housing cracks or breaks during a hard freeze. Actionable Fix: Water was left inside the skimmer throat without a proper expansion Gizzmo plug or skimmer skirt shield. Replace the cracked skimmer faceplate and body in the spring, and ensure the water level is dropped adequately below the skimmer next season.
- Root Cause: Vinyl liner pulls out of the coping track or tears under ice pressure. Actionable Fix: The water level dropped too low, causing the liner to stretch and contract violently under freezing loads. Refill the pool to the correct operational winter level and carefully reset the liner bead into the top track using a specialized pool liner lock tool while the material is warm.
Frequently Asked Questions
When is the best time to close my above ground pool?
You should close your above ground pool when daytime ambient water temperatures consistently drop below 65 degrees Fahrenheit for several consecutive days. Closing too early while water is still warm encourages rapid algae growth, while closing too late risks sudden freezing temperatures damaging your un-winterized plumbing lines.
Do I need to drain all the water out of my above ground pool for winter?
No, you must never drain an above ground pool completely. The weight of the remaining water is structurally required to hold the vinyl liner in place against the pool walls and floor and to prevent external groundwater pressure from lifting or collapsing the pool frame.
How do I keep water off the top of my winter cover?
Use an electric or manual submersible pool cover pump to remove standing rain and melted snow after major weather events. Keeping the cover relatively dry prevents excessive weight from ripping the cover material, pulling the cable out of the winch, or dragging the cover down into the pool water.
Can I use regular household antifreeze in my pool plumbing lines?
No, never use automotive antifreeze, which contains toxic ethylene glycol and will poison swimmers and ruin your pool liner. Always use non-toxic, propylene glycol-based pool antifreeze designed specifically for PVC plumbing and swimming pool applications.
What causes a pool air pillow to deflate over the winter?
Air pillows typically deflate due to minor punctures from ice edges, UV degradation of cheap vinyl, or faulty air valve seals. Inspect your air pillow for pinhole leaks before inflation, wrap rough pool edges with protective foam tape, and never overinflate the pillow beyond sixty percent capacity to allow for thermal contraction.
Secure Your Investment This Winter
Properly closing your above ground pool protects your financial investment and transforms next season's pool opening from a grueling chemical recovery project into a simple, effortless transition. Take the time to execute each winterization step meticulously, and your pool will remain safe, secure, and ready for immediate fun when warm weather returns.
