Your Sport Berkey® Filter Bottle has a lifespan of 50 years! When not using it for an extended period, remove the filter and fill the bottle with bleach at a ratio of one-quarter teaspoon per 2 liters of water, or a 50/50 mixture of 3% hydrogen peroxide. Rinse. Allow the parts to dry completely with the cap removed. Reassemble the bottle and, if possible, store it in an airtight bag. Do not allow the filter to freeze, do not place it in the microwave, and do not run hot water through it.