The Camelbak Groove Filters aid in bringing you clean tasting water on the go. These plant-based carbon filters easily slip into your Groove Bottle for continued taste filtering. Get one of these Groove Filter packs depending on your need. The two pack will last up to 60 gallons of use, while the six pack lasts 180 gallons. With average use, that's four months or an entire year of great tasting water. Keep the Camelbak Groove Filters in your bottle and keep the plastic water bottles at bay.