Botlfilter Portable Water Filter System Replacement Filter Bags, 16 Bags 16 water filter refill bags, for use with a botlfilter case (sold separately) Plant-based activated carbon filter Traps unwanted substances, such as chlorine, chloramines, lead, phenols, pesticides, and detergents Bags are biodegradable and compostable,no plastic to dispose of after use Botlfilter system removes organic contaminants from municipal tap water and meets nsf-standard 42 for chlorine, taste and odor reduction