iSpring F25U100 6-Stage 100GPD Ultra Violet Reverse Osmosis 3-Year Supply Filter Pack 25 pieces of 10 inch x 2.5 inch replacement water filters included, good for 3 years Supply Individually wrapped to keep freshness Fits iSpring reverse osmosis ultra violet water systems, and most other brand Name ro UV systems UV kills 99% of bacteria and virus; 11W UV Sterilization lamp included 100 GPD thin film composite (tfc) membrane included, tested by independent third-party to meet NSF/ANSI Standard