Alkin P21 Disposable Plastic Cartridge
W31 Mariner - Purifier Filter every 50 hours, Intake Filter every 100 hours W32 Mariner - Purifier filter every 70 hours, Intake filter every 100, Oil filter every 500 hours W3 and W4 - Purifier filter every 80 hours, Intake filter every 100 hours We recommend our customers to change/repack filters periodically to maintain air quality and performance based on the recommended hours..