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 If I change to BioGuard Armour sanitiser, will I have to change brands of PH increaser and decreaser? How long do I wait before I can get in my spa after treating water with chemicals? Comments 0 comments Article is closed for comments.