The InSinkErator F-601R Replacement Filter is the only water filter specifically designed for instant hot and hot/cool water dispensers. When paired with the InSinkErator Stainless Steel Tank, our carbon filters provide fresh-tasting water by reducing chlorine taste and odor, lead, mercury, cysts, asbestos and other impurities. The F-601R filter can also be adapted to any refrigerator, icemaker or virtually any drinking water system.