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Winter Closing Checklist

Close a pool for winter with clean water, defensible balance targets, protected plumbing, and cover safety basics.

Hub: Seasonal & Climate · When to use: You are preparing to shut down for winter and need a standard checklist before climate-specific details.
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Personalized winter closing plan

Using default baseline values until you log chemistry.

The full closing workflow stays visible because most of the winterizing work is mechanical and safety-driven, not personalized.

Log test

Winter Closing Playbook

Close the pool with clean water, balanced winter chemistry, protected plumbing, and a cover setup that is actually safe.

Do not hide a problem under the cover

If the pool is green, visibly contaminated, or failing overnight chlorine checks, clear that problem before closing instead of relying on a winter kit.

About your current CYA

Your last known CYA is 30 ppm. Use it to make sure your final FC is still within a sensible operating range for your pool rather than defaulting to a one-size-fits-all “SLAM close.”

1

Deep clean before shutdown

Organic debris left in the pool is future chlorine demand and future stain risk.

Brush walls, steps, benches, and behind ladders.
Vacuum debris and remove leaves and sediment.
Empty baskets and clean automatic cleaners before storage.
2

Balance around defensible winter ranges

Use ranges that protect the surface and equipment instead of magic numbers.

Bring pH into a practical winter range, commonly around 7.2-7.8 with 7.4-7.6 as a common target band.
Use TA and CH ranges that match the pool surface and the winterizing guidance you trust.
Review saturation index so you are not closing with obviously scale-forming or corrosive water.
Practical notes
  • • For plaster and aggregate pools, pay extra attention to CH and saturation index before closing.
3

Final sanitizer step

The goal is to close with clean, adequately chlorinated water, not to publish a universal 'close at shock level' rule.

Make sure the pool is clear and recently tested before you cover it.
Bring FC into an appropriate operating range for the current CYA and conditions.
If you use optional winterizing chemicals, follow their labels and understand what problem each product is solving.
Avoid copper-based algaecides because they can stain surfaces.
4

Winterize plumbing and equipment

This is the mechanical heart of the closing process.

Shut off power and label breakers as needed.
Drain pump, filter, heater, feeders, and exposed equipment per manual.
Blow out and plug lines according to your winterizing method and climate risk.
Use pool-formula or propylene-glycol antifreeze only where needed.
Stop conditions / cautions
  • • Never use automotive ethylene-glycol antifreeze in pool plumbing.
5

Set water level for the cover system

Water level depends on the cover strategy and the winterizing procedure, not on a universal depth rule.

Use the cover manufacturer and winterizing guidance for final water-level decisions.
Do not drain the pool completely.
Record the final water level and any special cover hardware notes for spring.
6

Treat the cover as a safety system

The closing is not finished until the site is secure.

Install and tension the cover correctly.
Manage standing water on solid covers as required by the cover type.
Secure ladders, rails, and loose deck items as needed.
Review off-season drowning hazards and access control around the covered pool.

Standards & Resources

PHTA winterizing tech note

Use PHTA winterizing guidance for baseline winter chemistry ranges and antifreeze cautions.

Checklist

  1. 1Clean the pool and resolve algae before you think about closing.
  2. 2Balance around defensible pH, TA, CH, and saturation-index ranges before shutdown.
  3. 3Drain and protect plumbing with pool-safe antifreeze only where needed.
  4. 4Handle cover installation as a safety step, not just a debris-control step.

Related Playbooks

Winterization by Climate

Choose the right winterization path using freeze-risk tiers instead of incorrect USDA zone mapping.

Winterizing In-Floor Cleaning Systems

Protect pop-up heads, valves, and booster equipment with low-pressure blowout practices and manufacturer-specific checks.

Winterizing Pool Heaters

Drain and isolate gas heaters, heat pumps, solar loops, and hybrid systems using manufacturer-specific instructions instead of one-size-fits-all blowout rules.