Keep your Core 300, 300S, 300S-P or P350 purifier at peak efficiency with exclusive 3-in-1 replacement filters available in four custom styles. The ultra-fine nylon pre-filter and activated carbon layer trap large particles and neutralize odors and fumes, while the inner filter removes dust, pollen, and more. Monitor filter life and receive replacement reminders in the VeSync app—swap filters every 6–8 months for consistently clean, healthy air.