Routinely descaling your coffee maker allows it to reach its ideal brewing temperature. Bar Keepers Friend’s Coffee Maker Descaler removes, dissolves, and destroys temperature-robbing mineral scale from the water reservoir and coils. Reaching the manufacturer’s ideal brewing temperature ensures maximum flavor extraction from your coffee beans. For best results, descale every three months, or according to your brewer’s instruction manual. After you’ve descaled, don’t forget to clean your machine with our Coffee Maker Cleaner, which removes coffee oils and residue. 355mL.