For fresh-tasting filtered water, replace your Hydra Pure filter regularly. Replacement filters sit inside the bottle, filtering out chlorine taste and odor that may be found in tap water. Ditch your disposable bottles and save with every sip. One water filter can replace up to 300 standard 16.9-ounce water bottles, better for the environment and for your wallet. Keep the fresh-tasting filtered water flowing by replacing the filters every 40 gallons or 2 months with this convenient 2-pack replacement filters. With Hydra Pure, you can take great-tasting filtered water anywhere.