No, it won't. The white stuff on your coffee maker is caused by the calcium material in your water. We recommend you to purchase iSpring RCC7 Reverse Osmosis System to pure your drinking water as the Reverse Osmosis Membrane can remove up to 99% of most contaminants including Arsenic, Nitrates, Radium, Chromium, Fluoride and dissolved solids such as sodium, calcium, iron, magnesium, copper.etc. The WGB21B provide you the basic water filtration for your whole house uses because it can remove up to 95% of sediment, chlorine, and other contaminants that cause foul tastes and odors.