What Is the Best Way to Winterize a Pool?

Drain water below the skimmer level, add winterizing chemicals, and securely cover the pool to protect it during the winter.

Why Winterizing Your Pool Is Important

Failing to close your pool correctly can lead to several problems:

• Frozen pipes and equipment: Water expands when it freezes, which can cause cracks in pipes and filters.
  

• Algae growth: Even in cold temperatures, untreated water can develop algae and bacteria.
  

• Debris buildup: Leaves and dirt can make reopening the pool a bigger hassle.
  

• Chemical imbalance: Without proper treatment, pool water can become corrosive or scale-forming, damaging surfaces and equipment.
  

Winterizing protects your investment and saves time and money when it’s time to swim again.

Step-by-Step Guide to Winterizing Your Pool

1. Balance the Water Chemistry

Before closing the pool, test and adjust the following levels:

• pH: Keep between 7.4-7.6
  

• Alkalinity: Maintain between 80-120 ppm
  

• Calcium Hardness: Keep between 200-400 ppm
  

• Chlorine or Sanitizer: Ensure levels are adequate to prevent algae growth
  

Balancing chemicals before closing prevents corrosion, scale buildup, and algae problems during winter. It also ensures a smooth reopening in the spring without excessive chemical adjustments.

2. Shock and Add Algaecide

• Shock the pool with a strong chlorine treatment to kill bacteria and contaminants.
  

• Use an algaecide to prevent algae from growing while the pool is closed.
  

• Let the pump run for at least 24 hours to circulate the chemicals thoroughly.
  

• Consider adding a winterizing chemical kit to maintain water quality over the months.
  

3. Clean and Remove Pool Accessories

• Skim and vacuum the pool to remove debris.
  

• Brush pool walls and floor to eliminate dirt and algae.
  

• Remove ladders, skimmer baskets, and other accessories to prevent damage.
  

• Store accessories in a dry location to avoid rust and deterioration.
  

4. Lower the Water Level

• For inground pools, lower the water just below the skimmer opening.
  

• For above-ground pools, follow manufacturer guidelines to prevent liner damage.
  

• Avoid draining the pool completely, as this can cause structural damage.
  

• If using a mesh cover, keep the water slightly higher to support the cover’s weight.
  

5. Drain and Protect Plumbing Equipment

• Backwash and drain the filter to remove excess water.
  

• Drain the pump, heater, and chlorinator to prevent freezing.
  

• Blow out plumbing lines using an air compressor to remove any trapped water.
  

• Add pool antifreeze to pipes if needed.
  

• Store detached equipment indoors to prolong its lifespan.
  

6. Cover the Pool

• Use a winter pool cover to keep out debris and prevent water contamination.
  

• Ensure the cover fits tightly to avoid wind damage.
  

• For above-ground pools, secure the cover with a cable and winch system.
  

• Check for rips or loose spots to prevent water and debris from getting inside.
  

• Consider using a pool pillow under the cover to help prevent ice expansion damage.
  

Additional Tips for Winter Pool Maintenance

• Check the cover regularly: Remove snow and debris to prevent sagging.
  

• Monitor water levels: Excess water can lead to cover damage or overflowing.
  

• Add winter chemicals as needed: Some pools benefit from mid-winter treatments.
  

• Inspect equipment mid-season: A quick check can help catch any issues before spring.
  

• Keep an eye on freezing temperatures: If your area experiences extreme cold, consider additional insulation for exposed plumbing.
  

By following these steps, you can ensure your pool stays in great condition through winter and is ready for an easy opening in the spring. A well-maintained pool during the offseason means less work when swim season returns, giving you more time to enjoy the water without unnecessary delays.