I recently purchased a 4-pack of FilterLogic water filters, which cost about the same as a single Samsung water filter. When the original filter in my Samsung refrigerator needed to be replaced, I bought a single filter(I forget the brand - possibly HDX?), the cost was about the same as the Samsung filter. This filter restricted the water flow to a trickle, which was very irritating. I then found FilterLogic and bought a single filter. The flow rate increased dramatically, the cost was about a fourth of what I had paid earlier, and I received my first 4-pack in 3 or 4 days. I am into my second 4-pack and I will continue to purchase this filter for the life of my refrigerator. I highly recommend this filter.