Stop. Don’t Just Cover Your Pool and Walk Away. An above ground pool winterizing kit is a bundle of chemicals that keeps your pool clean, algae-free, and damage-free all winter long. You add the chemicals, cover the pool, and your water stays protected until spring.
Sounds simple. But most pool owners skip steps or use the wrong products—and they open their pool in April to green water, stained liners, and cracked equipment.
Let me walk you through exactly what to do.
What Is an Above Ground Pool Winterizing Kit?
It’s a ready-made package of chemicals designed to protect your pool during the months it’s not running. Everything works together—you don’t have to guess what to buy or how much to use.
Most kits come in sizes based on your pool’s water volume:
- 7,500 gallons – Small pools
- 15,000 gallons – Medium pools
- 30,000 gallons – Large pools
Check your pool’s manual or measure the size before buying.
What’s Inside the Kit?
A good above ground pool winterizing kit usually includes:
- Pool shock – Kills bacteria and clears the water before you close up
- Winter algaecide – Stops algae from growing all winter under the cover
- Stain and scale preventer – Protects your liner and metal parts from buildup
- Winter floater – Slowly releases chlorine over several months
The mistake I see most often? People buy cheap kits that leave out the stain preventer. If you have hard water, that’s a big problem. Your liner can stain badly over winter.
When Should You Winterize?
Close your pool when water temperature stays below 65°F consistently.
Don’t go by air temperature. Water holds heat longer than air. If you close too early while the water is still warm, algae can grow before the cold sets in.
Quick Timing Tips
- Watch the water temperature, not the weather forecast
- Don’t wait for the first frost—that’s already too late
- Set aside one full day to do it properly
How Do You Use the Kit Step by Step?
This is the process that actually works. Follow it in order.
- Test and balance your water — Get pH between 7.2 and 7.6, and alkalinity between 80 and 120 ppm
- Clean the pool — Vacuum the floor, brush the walls, skim out any debris
- Shock the pool — Use the shock packet from your kit
- Add algaecide and stain preventer — Pour them directly into the water
- Run the pump for one hour — This circulates the chemicals evenly
- Lower the water level — Drop it 4 to 6 inches below the skimmer
- Remove your equipment — Take out the pump, filter, and hoses. Drain them fully so they don’t crack in the cold
- Cover the pool tightly — Make sure the cover is secure
- Drop in the winter floater — If your kit includes one, place it under the cover
One thing people always forget: draining the hoses and pump. Water left inside will freeze, expand, and crack your equipment. Don’t skip this.
Final Thoughts
You spent good money on your pool. Spending $40 and a few hours to protect it over winter just makes sense.
An above ground pool winterizing kit takes the guesswork out of closing season. You get everything you need in one package, and when spring comes, your pool will be clean and ready to go.