How to Drain and Refill a Hot Tub Properly

Over time, hot tub water becomes saturated with minerals, chemicals, and contaminants that make it hard to balance and keep clean. Regular draining and refilling restores water quality and extends the life of your spa.

Benefits of Fresh Water

• Easier to maintain balanced water chemistry

• More enjoyable and sanitary soaking experience

• Prevents scaling and equipment damage

• Reduces buildup of contaminants

How Often to Drain and Refill Your Hot Tub

Most hot tubs should be drained and refilled every three to four months. Heavy use or high bather loads may require more frequent water changes.

Step-by-Step Guide to Draining and Refilling

Step 1: Turn Off the Power

• Shut off the spa at the breaker to prevent damage or injury.

• Never operate pumps or heaters while the tub is empty.

Step 2: Attach a Hose to the Drain

• Locate the drain valve, usually near the base of the tub.

• Connect a garden hose and direct it to a safe drainage area.

Step 3: Open the Drain Valve

• Allow the water to flow out completely.

• Use a wet/dry vacuum to remove remaining water from seats and footwells if necessary.

Step 4: Clean the Shell

• Once empty, wipe down the interior with a spa-safe cleaner.

• Rinse thoroughly to avoid leaving residues.

Step 5: Close the Drain Valve

• Make sure the valve is securely closed before refilling.

• Double-check that all caps and plugs are in place.

Step 6: Refill the Hot Tub

• Place the hose in the filter compartment to minimize airlocks.

• Fill the tub to the recommended water level marked inside.

Step 7: Turn the Power Back On

• Once filled, restore power at the breaker.

• Run the pump and heater, and check for proper operation.

Tips for a Smooth Process

Use a Pre-Filter

• Attach a pre-filter to your hose to reduce minerals and impurities entering the tub.

Balance the Water After Filling

• Test and adjust pH, alkalinity, sanitizer, and calcium hardness.

• Shock the water to start fresh.

Schedule Your Water Changes

• Mark your calendar to drain and refill seasonally or as needed.

Advanced Tips for Experienced Owners

1. Flush the plumbing with a spa line cleaner before draining to remove hidden buildup.

2. Inspect and clean filters while the tub is empty.

3. Check for leaks or wear on jets and fittings during cleaning.

4. Drain on a sunny day to speed up drying and make cleaning easier.

Common Mistakes to Avoid

• Leaving the pump or heater on while draining.

• Refilling without checking that all valves are closed.

• Using harsh household cleaners that can damage the shell.

• Forgetting to balance water after refilling.

By following these steps, you can properly drain and refill your hot tub, keeping it clean, balanced, and ready for relaxing soaks. Regular maintenance ensures a safe and enjoyable spa experience for everyone.