Super-efficient filtration: Designed for the ultimate safety and efficiency. We adopt high-precision natural activated carbon granules to execute the best water purification performance. The filter effectively removes chlorine, taste and odor, cysts, rust, corrosion, sediment, and turbidity. Please replace the filter every 6 months or 400 gallons to ensure prime water quality. Compatible design to the original: Our professional design team modeled Waterdrop replacement filters thousands of times to fit for your refrigerator. High-quality filter: Having a top quality product has always been our approach to water purification. The Waterdrop goal is, and has been since the beginning, to design, engineer and deliver products that meet our—and your—uncompromising standards. Our U.S. quality-control team members vet every material to ensure it meets those standards by researching ingredients, auditing sourcing practices, and testing products—all to give you peace of mind.