Opening your pool in the spring and properly winterizing it before winter freezes are the two most critical operational moments in seasonal pool ownership. One cracked plumbing pipe beneath concrete coping can cost thousands of dollars in repairs.
The 6-Step Inground Winterization Checklist
- Deep Clean & Vacuum: Remove organic matter from the pool. Debris left under winter covers will decompose into stains.
- Balance Water Chemistry: Adjust pH to 7.4–7.6, Total Alkalinity to 100 ppm, and Calcium Hardness to 250–350 ppm.
- Lower Water Level: Lower water 4 to 6 inches below the skimmer mouth for mesh safety covers, or 2 inches below for solid winter covers.
- Drain Equipment Plugs: Remove drain plugs from the pump housing, filter tank, chlorinator, and heater manifold. Store plugs inside the pump strainer basket.
- Blow Out Lines & Install Freeze Plugs: Use a blower to blow air through skimmers and return lines until bubbling, then install threaded rubber expansion plugs.
- Install Safety Cover: Secure springs and straps to deck brass anchors.
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Frequently Asked Questions
When is the best time to close and winterize a pool?
Wait until water temperature consistently drops below 60°F (15°C). Algae struggles to grow in cold water below 60°F. Closing too early while temperatures are still warm often leads to opening an algae-filled pool in spring.
Do I need to add pool antifreeze to my plumbing lines?
Non-toxic propylene glycol pool antifreeze is strongly recommended in regions experiencing hard freezes. After blowing out water with a cyclone blower, adding 1 gallon of swimming pool antifreeze into each skimmer line provides freeze protection insurance.