How long do filters last? September 05, 2017 04:45 Updated Follow Pleated filters should last approximately 18 months. Purezone filters are designed to be replaced every 3-5 months. You can purchase new filters at www.spatore.com.au Related articles How much do filters cost? I have a white line above the water line of my spa - what can I do? How often do I need to sanitise? How do thermostats work? Is it suitable to use only one Nature2 Stick for a swim spa? Comments 0 comments Article is closed for comments.