As the swimming season winds down, properly closing your pool is one of the most important steps you can take to protect your investment. Whether you have an in-ground or above-ground pool, winterizing it correctly prevents costly damage, keeps water cleaner, and makes spring opening much easier.

Why Closing Your Pool Matters

• Prevents Freeze Damage – Expanding ice can crack pipes, pumps, filters, and even pool walls.
• Keeps Water Balanced – Proper chemistry reduces algae and staining during the off-season.
• Saves Time in Spring – A correctly closed pool often needs less cleaning and fewer chemicals at opening.

Step 1: Balance the Water Chemistry

Before you start, test and adjust your water:

• pH: 7.2 – 7.6
• Alkalinity: 80 – 120 ppm
• Calcium Hardness: 200 – 400 ppm
• Chlorine or Sanitizer: Shock the pool 24–48 hours before closing

Pro tip: Use a Pool Closing Kit for ease of use and extra protection.

Step 2: Deep Clean the Pool

• Skim leaves and debris.
• Brush the walls and floor.
• Vacuum thoroughly.

Starting with clean water helps prevent staining and algae blooms under the cover.

Step 3: Lower the Water Level

• In-ground pools: Lower below the skimmer opening.
• Above-ground pools: Lower to just below the return fitting.

Never fully drain your pool — it can damage the liner or structure.

Step 4: Drain and Protect Equipment

• Disconnect and drain pump, filter, and heater.
• Remove drain plugs so water can escape.
• Blow out and plug return and skimmer lines (for in-ground pools).
• Store removable equipment indoors if possible.

Step 5: Add Winterizing Chemicals

• Pool shock (chlorine or non-chlorine based)
• Algaecide (non-foaming, designed for winter use)
• Scale and stain preventer

These chemicals keep the water clear and balanced until spring. Get your Pool Closing Chemicals.

Step 6: Cover the Pool Securely

• In-ground pools: Use a safety or solid winter cover.
• Above-ground pools: Use a winter cover with an air pillow to relieve ice pressure.

Make sure the cover is tight and secure to keep debris and sunlight out.

Bonus Tips

• Remove ladders, steps, and accessories before covering.
• Store chemicals in a cool, dry place away from direct sunlight.
• Check the cover periodically during winter to remove excess water and debris.

Final Thoughts

Closing your pool the right way sets you up for an easy, stress-free spring opening. With the right balance of water chemistry, equipment care, and a secure cover, you’ll save money and extend the life of your pool.

Need winterizing supplies? Shop our full line of pool closing kits, covers, and accessories to make the job simple and effective.