How to Close Pool Without Draining Completely

Closing a pool at the end of the season does not always mean draining it completely. In fact, fully draining your pool can lead to costly damage to the liner, plaster, or even the entire structure. Instead, pool owners can follow a safer and more efficient process that keeps enough water in place to protect the pool while still preventing freeze damage and contamination. This guide walks you through exactly how to close your pool without draining completely.

Why You Should Not Fully Drain Your Pool

Many pool owners think draining is the best way to start winterizing, but that is rarely true. Here is why:

• Structural Risks: Draining can cause cracks or bulging due to ground pressure.

• Liner Damage: Vinyl liners shrink or wrinkle when left dry for too long.

• Water Table Problems: If the surrounding ground is saturated, an empty pool can even lift out of place.

Keeping water in the pool helps avoid these issues and gives the pool stability during the off-season.

Step One: Balance the Water Chemistry

Before closing, test and adjust the water:

• pH should be between 7.2 and 7.6

• Alkalinity between 80 and 120 ppm

• Calcium hardness between 200 and 400 ppm

Balancing the chemistry prevents scaling, staining, and corrosion while the pool is closed.

Step Two: Shock and Add Algaecide

A strong chlorine shock kills lingering bacteria, while a quality algaecide helps prevent algae growth under the cover. This step ensures you open to cleaner, clearer water in the spring.

Step Three: Lower the Water Level Slightly

Do not fully drain the pool. Instead, lower the water level just below the skimmer. This prevents freeze damage to the skimmer but keeps enough water to stabilize the pool.

Step Four: Clean and Remove Accessories

Brush and vacuum the pool thoroughly to remove debris. Take out ladders, skimmer baskets, and other accessories. Store them indoors to avoid damage during the off-season.

Step Five: Protect the Plumbing and Equipment

• Blow out the plumbing lines using a shop vac or air compressor.

• Add pool antifreeze to the lines to prevent freezing.

• Drain the pump, heater, and filter to avoid cracks.

These steps protect expensive pool equipment from winter damage.

Step Six: Cover the Pool Securely

A quality pool cover is essential. Choose a strong winter or safety cover that fits tightly over the pool to keep debris, animals, and sunlight out. Secure it with water bags, anchors, or the system designed for your pool.

Keeping Your Pool Safe All Winter

Closing without draining completely is the best choice for protecting your pool’s structure and ensuring an easier opening in the spring. By balancing chemicals, lowering the water just enough, and properly covering the pool, you avoid major repairs and keep your pool ready for the next season.

Winterizing your pool does not have to be stressful. Follow these steps, and your pool will stay safe and stable all winter long, waiting for you to enjoy again when warm weather returns.