Anti-Microbial Portable Filter Pack For Use With Canadian Spa Portable Spas Rio Grande\nA pack of 4 \u00D7 15 ft\u00B2 antimicrobial cartridges, suitable for all portable Canadian Spas (V1 and V2 units from 2013 onwards).These high-quality cartridges filter out unwanted dirt and grime, optimising pump performance by protecting the pump and heater from debris that would otherwise cause damage and shorten lifespan. The cartridges can be easily cleaned and reused thanks to their high-quality material blend.Replacement scheduleCartridges should be replaced every 4\u20136 weeks as per the manufacturer's recommended replacement schedule, or sooner if showing visible signs of wear (matted pleats, rigid framework, persistent discolouration).Features:\n--Antimicrobial filter media \u2014 fights and inhibits bacterial growth in the cartridge itself\n\n--Less frequent replacement than non-antimicrobial alternatives\n\n--Cleaner water overall \u2014 keeps the cs