The EPTWFU01 model filter comes in two brands; Clearchoice and Frigidaire. Each filter has its advantages and disadvantages that will factor into your purchase decision. The factory original OEM EPTWFU01 filter is the most expensive of the two, however it is also the most highly rated in terms of certification. The original EPTWFU01 filter is the only one to receive passing grades from NSF/ANSI International for Standards 42 and 53. The ClearChoice product does not have this certification, but it is made in the USA and costs a fraction of the factory original cost.