How to Close or Winterize Your Pool in 10 Easy Steps

Protect your seasonal pool with help from The Home Depot. When the weather starts to cool, it’s important to know how to properly close your property’s swimming pool. Properly closing a pool in the fall can save you money on costly repairs and prep work when it comes time to reopen your pool in the spring.

Step-by-Step Pool Closing and Winterization

Test Pool

Experts recomend that balanced water chemistry should be at the following levels:

  • pH: 7.2 – 7.6
  • Total Alkalinity: 80 – 120 Parts per Million (PPM) [80 – 120 Ml/L]
  • Calcium Hardness: 180 – 220 Parts per Million (PPM)

1. balance

Balance your pool’s water appropriately to prevent corrosion or heavy calcium buildup during closure.

2. treat

Add winterizing algaecide to kill any existing algae. This stops algae from blooming and prevents discoloration and foul smells.

3. Clean

Thoroughly clean the pool, skimming the water to remove leaves, insects and debris before brushing and vacuuming your pool.

4. Filter

Run the pool’s filter continuously for 24 to 48 hours to remove finer particles.

5. Clear

After running the filter for 24 to 48 hours, remove the skimmer baskets, cleaners, ladders, hoses, filters, solar blankets and other equipment and pool accessories.

6. Drain

Lower the pool’s water level 6” (150mm) below the skimmer level at the prescribed rate of 1” (25mm) per hour.

7. Pump

Drain all pumping, filtering, heating and sanitizing equipment to prevent damage caused by freezing.

8. Protect

Protect pool attachments against freezing by lubricating O-rings, valves and plugs and blowing out all lines.

9. Plug

Plug pool lines with expansion plugs to further protect against freezing.

10. Cover

Cover the pool with a tight-fitting cover.