Eco Four Twenty Refill Set
The personal air filter cartridge by Eco Four Twenty last up to 500 exhales before needing to be replaced. The average user will use this for 2-3 months. When the time comes to replace simply pick up one of these replacement cartridges which includes two refill filters. The high quality 2 stage filter features activated Coconut Shell-Carbon Filter + HEPA Filter, which means this filters more than cheap competitors!