Pool Closing Checklist

1. Clean and balance first

• Brush and vacuum the whole pool. Clean skimmer and pump baskets.
• Run the filter 24 hours so the water is clear going into winter.
• Balance: alkalinity 80–120 ppm, pH 7.2–7.6, calcium 200–400 ppm.
• Shock in the evening, circulate overnight, then add a winter algaecide and stain preventer per label.

2. Lower the water and winterize plumbing

• Mesh cover: drain to just below the skimmer. Solid cover: about 6 inches below the tile line. Check your cover manual.
• Drain the pump, filter, heater, and chlorinator. Remove drain plugs and store them in the pump basket so you find them in spring.
• Blow out or drain return lines and skimmer lines, then install winterizing plugs and skimmer guards.
• Never use antifreeze formulated for cars — only pool-safe products, and only if your manual calls for them.

3. Cover and store

• Remove ladders, rails, toys, and cleaners. Store them dry.
• Place air pillows under solid covers to absorb ice expansion.
• Install the cover taut and secure it — cables, clips, or water bags depending on type.
• Through winter: pump standing water off the cover, clear leaves, and check tension after storms.

Common closing mistakes

• Closing a dirty pool: Debris stains and feeds algae all winter.
• Skipping the balance: Unbalanced water etches plaster and corrodes equipment over months.
• Forgetting to drain equipment: One freeze can crack a pump housing or filter.

In spring, follow the Pool Opening Checklist to reverse these steps.