It is the interest of BRITA MEMO BRITA his works to ensure their turnover by making you replace the cartridge every four weeks even if it is not yet necessary. For that: First pick up the BRITA MEMO with a small screwdriver to take the number written on the back because there are several sizes. If it is stuck, pour hot water or vinegar to dissolve scale. Then call in the morning (for France) for service BRITA August 10 73 15 45 who will take your address and send you another one for free. For Belgium, BRITA call that will give you the phone number.