NO LEAKAGE & 100% COMPATIBILTY: We are one of the first generic filters on the market. We made a filter that is designed to exact standards and fit as the original GE MWF Filter. Many generic filters on the market are cheap knockoffs sold by Chinese companies looking to make a quick buck. These Chinese companies sell filters under different brand names, but the one thing they have in common is cheaply made carbon blocks with poor reduction rates. ADVANCED CARBON BLOCK: A refrigerator water filter is only as good as its carbon block inside it. PURELINE uses advanced carbon blocks for their filter just as GE does. Advanced carbon blocks do more than just mechanical filtration. The carbon block also further filters contaminants through electro-kinetic adsorption and physical adsorption. CERTIFICATION: PURELINE filters have been tested and certified by the NSF, WQA, and IAPMO.