Guide to Changing Spa Water in Winter

ByTim Rodger

Changing your spa water is part of regular maintenance — sometimes it’s needed because the water is overused, neglected, or has high levels of dissolved solids. Even in freezing weather, you can safely change your water without damaging your spa.

Full Water Change in Cold Weather

Steps:

  1. Heat spa to normal temperature before draining.
  2. Keep the cover closed as much as possible while draining.
  3. Refill promptly after draining.
  4. Turn spa back on to reheat — pump motor heat will help protect plumbing.

Partial Change (Dilution Method)

For owners who prefer not to fully drain in winter:

  1. Drain ¾ of the water.
  2. Refill spa.
  3. Drain ¾ again.
  4. Refill spa again.

This removes ~94% of the original water — almost a full change.

Winter Water Supply Tips

  • Most hose spigots can be used briefly in winter if you turn them off and re-winterize afterward.
  • If outside spigots are shut off:
    • Use a laundry tub with a hose adapter.
    • Or connect your garden hose to the cold-water supply for your washing machine (standard hose threads).

Bottom line:
With the right steps, you can change your spa water safely in any season — no freeze damage, no stress.

Tim Rodger is with the water care department of The Spa Marvel Company and is available to help you and your clients with water care questions seven days a week (but not 24 hours a day).

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