Frequently Asked Questions How often do I need to descale my Philips Cafe Gourmet? How often the Cafe Gourmet needs to be descaled depends on the usage frequency and water hardness in your area. Please see notes and tips below. Descale the appliance when you see scale is built up in the water tank, or in case of normal use (two brewing cycles a day): Every two months if you use soft water (up to 13dH) or filtered water. Every month if you use hard water (over 13dH).