How to Blow Out Pool Lines Before Winter

Blowing out your pool lines is an essential part of winterizing your pool. When water freezes in the lines, it expands and can cause significant damage. By removing the water properly, you help ensure your pool stays in good condition during the winter months.

Common Risks of Not Blowing Out Lines

• Cracked pipes that require expensive repairs in the spring

• Damage to pumps, filters, and heaters

• Leaks when reopening the pool

• Reduced lifespan of plumbing and equipment

Tools and Supplies You Will Need

Before starting, gather all necessary tools and materials to make the process efficient and safe.

Basic Tools

• Air compressor or shop vac

• Pool antifreeze (non-toxic)

• Skimmer and return line plugs

• Wrenches and pliers

• Teflon tape (optional for sealing)

• Safety goggles and gloves

Optional Items

• Pressure gauge to monitor air levels

• Maintenance log to track work done

• Helper to assist with spotting bubbles and securing plugs

Step-by-Step Guide to Blowing Out Pool Lines

Follow this sequence carefully to avoid missing any critical steps.

Step 1: Lower the Water Level

• Pump water out until it’s 4–6 inches below the skimmer.

• This helps keep water from entering the skimmer line and freezing.

• Remove floating debris to prevent it from clogging the skimmer during the process.

Step 2: Turn Off and Drain Equipment

• Shut off power to all equipment, including pumps, heaters, and lights.

• Close all valves leading to the equipment pad.

• Remove drain plugs from pump, heater, and filter, letting trapped water drain completely.

Step 3: Attach the Air Compressor

• Connect the air compressor or shop vac to the pump basket opening or blow-out port.

• Use Teflon tape on the fitting for a secure seal.

• Set the compressor to a safe pressure (20–30 PSI).

Step 4: Blow Out the Main Drain

• Begin blowing air into the system.

• Watch for bubbles rising from the main drain in the deep end.

• Continue blowing for 30–60 seconds after bubbles appear to remove remaining water.

Step 5: Blow Out the Skimmer and Return Lines

• Close the main drain valve and open the skimmer valve.

• Blow air until bubbles rise in the skimmer.

• Insert a skimmer plug to seal the line.

• Open each return line one at a time and blow air through it until bubbles appear.

• Plug each return line after bubbles surface.

Step 6: Add Pool Antifreeze (Optional)

• Pour pool antifreeze into skimmer and return lines if you live in a region with harsh winters.

• This adds an extra layer of protection in case small amounts of water remain.

Advanced Tips for Effective Winterization

Air Pressure Management

1. Never exceed 30 PSI to avoid damaging the pipes.

2. Start at a lower setting and gradually increase if needed.

Helper Role

• Have someone watch the pool for bubbles while you handle the compressor.

• A helper can also help secure plugs quickly when bubbles appear.

Labeling and Documentation

• Label valves, plugs, and pipes so you can reinstall them easily in spring.

• Keep a maintenance log noting dates, materials used, and any repairs made.

Avoiding Common Mistakes

• Using excessive air pressure that can crack pipes.

• Forgetting to open certain valves, leaving sections filled with water.

• Failing to remove all drain plugs before starting.

• Not adding antifreeze in extremely cold regions where pipes are at greater risk.

Preparing Equipment for Storage

Pump and Filter

• Fully drain water from pump and filter.

• Remove drain plugs and store them inside the pump basket.

• Cover the equipment with a breathable, water-resistant cover to protect from snow and debris.

Hoses and Accessories

• Disconnect and drain all hoses completely.

• Store them in a warm, dry location to prevent cracking.

• Remove and store ladders, diving boards, and rails to prevent weather damage.

Extra Safety Tips

• Work slowly and double-check each line before moving on.

• Keep children and pets away from the work area.

• Read the manual for your air compressor and follow manufacturer guidelines.

Monitoring Your Pool During Winter

• Inspect the pool cover periodically for damage, sagging, or debris buildup.

• Remove snow and water from the cover to prevent it from tearing.

• Check plugs and seals after strong storms to ensure they remain tight.

• Make sure no water is collecting at the base of the pool where it can freeze and cause damage.

Seasonal Considerations

• In areas with mild winters, check periodically to ensure no water has re-entered the pipes.

• In colder climates, consider adding a second round of antifreeze mid-winter if there’s heavy precipitation.

With these thorough steps and detailed insights, you can confidently blow out your pool lines and prepare your pool for the winter season. A well-executed winterization process helps preserve your pool’s plumbing and equipment, saving you time and money when reopening in the spring.