How often should you change cold plunge water?
In this article
With the included filtration only, change the water about every 30–40 days. With UV XL or Ozone, every 2–3 months, and with both together every 3–4 months. Getting in sweaty or without a shower shortens these times; showering before you plunge and keeping the lid on lengthens them.
One of the biggest differences between a cold plunge and a tub of ice is the water itself: with continuous filtration you do not empty it after every session. How long it lasts depends on your water care and on how you use it.
The answer in one table
| Water care | Change the water about every |
|---|---|
| Included filtration only | 30–40 days |
| Filtration + UV XL or Ozone | 2–3 months |
| Filtration + UV XL and Ozone | 3–4 months |
These are typical times for a household. In a gym, club or hotel with many users a day, plan for shorter intervals. See our guide for businesses.
Habits that make water last longer
- Rinse off before you get in, without lotions or oils on your skin.
- Clean feet. A mat or towel next to the tub helps, especially outdoors.
- Keep the lid on between sessions to keep out dust, leaves and insects.
- Change the filter every 30–40 days. Use an original replacement filter, and check it in between.
- Add UV or Ozone. We recommend both; if you choose one, UV XL is our first choice, indoors and outdoors. Ozone also works in both places. The UV XL vs Ozone page explains the difference.
Signs it is time to change the water
- The water looks cloudy and does not clear after the filter is cleaned or replaced
- A film or foam on the surface
- A smell that was not there before
How to change it
Switch the system off, connect a garden hose to the lower valve and let the water drain where you want it. Clean the inside of the tub with a soft sponge and soapy water or a mild disinfectant such as Dettol, never bleach. Refill with the hose, switch on and let the chiller bring the water back to your temperature. Our water care guide covers the full routine.
Frequently asked questions
Do I need chemicals?
Not with good filtration and UV or Ozone, plus the simple habits above.
Can I use the old water for the garden?
Untreated water with no chemicals added is usually fine for watering, but avoid it if you have used any cleaning products in the tub.
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