The Brita Longlast Filter works 3x longer, so you can enjoy great-tasting Brita-filtered water for up to six months between filter replacements. It even filters lead, which can be found in some tap water. Brita filter's activated carbon & ion exchange resin work together to filter your water so you get healthier, great-tasting drinking water. These filters are designed to last up to 120 gallons, or about six months for the average household, and can provide great-tasting, filtered water for your family.