Aquasana EQ-300 Whole House 3-Year 300000-Gallon Water Filtration System Aquasana Rhino EQ-300 is certified by NSF to remove 97% of chlorine for up to 300,000 gallons Does not require salt, electricity, or back flushing Includes pre-filter, copper-zinc and carbon filtration stages with standard fittings Filtering your water improves indoor air quality by reducing chemicals that vaporize in shower steam Great tasting, healthy water throughout your home