When to Drain & Refill Your Hot Tub
How to recognize when water chemistry can no longer be corrected and starting fresh is the best option.
Even with proper testing and weekly maintenance, hot tub water eventually reaches a point where chemicals stop working effectively. This guide explains when it’s time to drain and refill your hot tub and why it’s an important part of long-term water care.
How Often to Drain & Refill
Most hot tubs should be drained and refilled every three to four months. Heavy use, frequent soaking, or mineral-heavy water may require more frequent water changes.
Signs It’s Time for Fresh Water
- Cloudy water that returns quickly
- Persistent foam or strong odors
- Sanitizer levels that drop unusually fast
- Water older than a few months
- Recurring issues despite proper balancing
Why Draining Works
Over time, contaminants and dissolved solids build up in hot tub water and plumbing lines. Draining, flushing, and refilling removes this buildup and restores water clarity and sanitizer effectiveness.
Demonstration video courtesy of Swim University
Next Steps
After refilling your hot tub, follow a proper startup and water balancing process to ensure clean, comfortable soaking from day one.