How to Change Spa Pool Water in Australia

Change spa water when the current water-care guidance, usage and water condition indicate that a fresh fill is appropriate. There is no universal three-, four- or six-month rule that fits every spa and household.

When Should You Consider a Water Change?

Factors include bather load, difficulty maintaining water balance, accumulated dissolved material, contamination, extended periods of poor water quality and the instructions for your sanitising system. Follow the spa manual and water-care product guidance for the exact setup.

Before Draining

• Read the drain and shutdown instructions for the exact spa model.
• Turn off or isolate electrical equipment as directed by the manual.
• Choose a lawful drainage location that will not flood buildings, neighbouring property or sensitive landscaping.
• If a plumbing-cleaning product is required, use only a spa-compatible product and follow its label.

Drain the Spa

Use the drain fitting or approved pumping method described for your model. Drain designs differ, so do not rely on a generic instruction about pulling, twisting or removing a particular fitting unless it matches your spa.

Clean the Empty Shell

Use cleaning products approved for the shell and components. Avoid abrasive tools or unverified household-chemical mixtures that could damage acrylic, seals, pillows or fittings. Rinse away cleaner residue before refilling.

Inspect Filters and Equipment

Use the empty-spa period to inspect filters, visible fittings and accessible equipment areas. Clean or replace filters according to their condition and the manufacturer instructions.

Refill Correctly

Follow the model-specific refill instructions so pumps can prime correctly and the water reaches the required level before operation. Restore power only when the product instructions say it is appropriate.

Restart Water Chemistry

Test the new fill water and start the sanitising programme using the exact chemical-product directions. Do not copy a fixed dose from an evergreen article because spa volume and chemical concentration vary.

After Refill

Confirm circulation, inspect for leaks, re-test the required water parameters after the system has circulated and do not use the spa until water conditions are within the appropriate range for your system.

Related Guides

Spa Maintenance Guide · Starting With New Water · Water Sanitisation Guide

Updated: 25 August 2026.