Countertop water filtration models will have the longest life and will filter approximately 400 gallons of water.
Hand forged knives are the top of the line in quality. It's one of the oldest methods of construction using handcraftsmanship, producing the strongest and sharpest blade.
All straight-edge knives need sharpening, but knives with serrated edges do not. Remember, a dull knife can be more dangerous than a sharp one.