Keep healthy, purified water flowing from your faucets with a WHAFFF under sink replacement filter. Installation is easy and shipping is free. When you use a Whirlpool UltraEase™ Kitchen & Bath Undersink Water Replacement Filter you might be surprised just how great your municipal or well water can taste. This filter attaches directly to an existing WHAFFS kitchen sink filter system, and removes common contaminants in drinking water, including bacteria and viruses. Installation couldn’t be easier, so it’s never a chore to replace this under the sink filter when it’s time to switch in a new filter. Whirlpool is known for producing quality water filtration products, and its cartridge replacement for the kitchen sink filter system is no exception. Drink water that’s more pure with less hassle.