Item description from the seller Certified to reduce 99% of lead as well as other potentially harmful contaminants, everydrop filters offer convenient, filtered water for you and your family. For the cleanest water, replace your everydrop filter every 4-6 months (or 200 gallons). Installation: Remove expired water filter from the refrigerator. (Take note of how it was installed) Wet the nozzles of the new water filter. (Sometimes helps with installation) Insert the new filter the same way the expired one was installed. Run 4 gallons of water through the filter before use. Reset the water filter expiration timer on your refrigerator. Replace filter every 4 to 6 months.