WLF-EF01 is a universal inline filter manufactured in South Korea which is specially designed using Concentrated Carbon Technology for refrigerator, ice maker and under the sink. There is a push in and out connector which enables very easy installation and operation, no tools required. Can be installed without any knowledge of plumbing Manufactured in South Korea from NSF certified facility and our facility is regularly audited via NSF and other few professional institutions. Certified brands are Samsung, LG, GE, Omnipure, Daewoo, Aqua-Pure, American Plumber, Omnifilter, Water Sentinel, Wpro. Best alternative filter for GXRTDR, DA29-101051. WSE-100, IL-IM-01, WIC-6A, R200, DD-7098, EF-9603, K2533JJ, 5231JA2010A, 5231JA2010B, 5231JA2012A, WSI-1, USC100 This inline filter uses compressed block - NOT GAC (Granulated Carbon) or extruded block and elements cannot channel, bypass or fluidize. There is also low binder content and high dirt capacity