How Often Should You Drain and Refill a Hot Tub?

Direct answer

For traditional chlorine or bromine care, Hot Spring and Jacuzzi both document draining and refilling about every three to four months (Hot Spring; Jacuzzi). Hot Spring states that spas using its salt water system can keep water up to about twelve months when the system is properly maintained, with the caveat that bather load and chemistry still affect water life (Hot Spring). Confirm the interval printed in your own owner’s manual before treating any figure as universal.

Safety note

Disconnect power before draining if your manual requires it. Follow label directions for any purge or cleaners used in an empty spa. Do not mix sanitizer systems when you refill. After refill, follow your manual’s fill path and air-lock steps so the heater is not run dry. See Hot Tub Not Heating After a Refill if heat fails after a water change. If your fill water is hard or mineral-heavy, see How to Fill a Hot Tub With Hard Water.

Scheduled drain vs. drain because the water will not clear

This article covers planned water changes on a maintenance calendar.

Cloudy water that will not clear after chemistry and filter fixes is a different decision path. Use Should You Drain a Hot Tub if the Water Is Cloudy? for that case. Foam that returns after correct chemistry can also push a drain sooner; Hot Spring ties concentrated soap build-up to a refill when the water feels unclean and notes that water life can be about four months depending on soap input (Hot Spring Highlife owner’s manual). See Why Is My Hot Tub Water Foamy?. Slimy or slippery seats, walls, or jets are another drain prompt on Jacuzzi’s drain guidance; see Why Do My Hot Tub Surfaces Feel Slimy?.

Manufacturer intervals to compare

Traditional water care: about every three to four months

Hot Spring’s FAQ states that most spas with traditional water care should be drained and refilled every three to four months because of chemical build-up (Hot Spring). The same three-to-four-month figure appears in Hot Spring’s maintenance schedule and in the Highlife owner’s manual water-change note (Hot Spring; Hot Spring Highlife owner’s manual).

Jacuzzi’s beginner guide schedules a complete drain and refill every three to four months, or when total dissolved solids exceed 2,000 ppm (Jacuzzi).

Salt systems: longer water life, with limits

Hot Spring states that salt-system water can last up to a year, and that with normal use and proper maintenance the FreshWater Salt System can keep water clean for up to twelve months (Hot Spring). The Highlife manual likewise says salt-system water may last much longer, up to twelve months, with proper care, and refers owners to the salt-system manual for details (Hot Spring Highlife owner’s manual). Hot Spring footnotes that bather load and chemistry affect water life (Hot Spring).

Do not apply a twelve-month interval to a spa that is not equipped and maintained as that salt-system documentation requires.

Heavy use can shorten the interval

Hot Spring notes that heavier use means water needs changing sooner than a lightly used spa (Hot Spring). Jacuzzi’s beginner guide states that heavy usage may require more frequent changes and gives every two to three months with daily use as that guide’s example (Jacuzzi). Those are manufacturer statements, not a TubWise usage survey.

What builds up between drains

Hot Spring links traditional drain timing to chemical build-up (Hot Spring). Jacuzzi uses high TDS, above 2,000 ppm in its beginner guide, as one trigger to drain even inside the calendar window (Jacuzzi). Soap and body oils can also force an earlier change on Hot Spring’s soap-build-up guidance (Hot Spring Highlife owner’s manual).

Testing and balancing between drains still matter. See How Often Should You Test Hot Tub Water?.

Safe homeowner sequence at a high level

Exact valves and fill paths are model-specific. In outline only:

1. Follow your manual for power-off and drain valve steps
2. Clean the empty shell only with cleaners your brand allows (How to Clean a Hot Tub Shell Without Damaging It)
3. Refill through the path your manual requires (Hot Spring Highlife manuals specify filling through the filter compartment). To estimate how long the refill may take, use the Hot Tub Fill Time Calculator with your spa’s listed capacity and hose flow rate. It is a planning estimate, not an exact finish time.
4. Restart, balance, and sanitize only with label-supported products
5. Watch for air-lock symptoms after refill

For where this task sits on a full calendar, see Hot Tub Maintenance Checklist: Weekly, Monthly, and Seasonal Tasks.

When to stop and call a technician

• You cannot locate or operate the drain hardware safely from the manual
• Leaks appear during or after the drain
• The spa will not restart, heat, or circulate after refill despite the manual’s purge steps
• A salt or monitoring system needs dealer service messages cleared
• Winterizing or long absences require procedures beyond a simple drain