Compatible with our EcoPure ECOP20 system, these dual-stage filters deliver cleaner, healthier drinking water right from your kitchen sink or refrigerator. Made using high-quality activated carbon block, the ECODWF filters feature a highly adsorptive, positively-charged material that removes greater amounts of impurities from your water than you'd get with a sediment filter. Their encapsulated filter design feature means filter changes are quick and mess-free. No tools. No need to shut off water supply. No touching dirty filters. For best filtration results, please replace your ECODWF filters every six months, as recommended.