You need to change your refrigerator water filter every six months, as: 1- It provides better tasting and smelling water 2- It helps remove fine particles and sediment from the water 3- It prevents unabsorbed water contaminants and newly formed bacteria from being reintroduced into your drinking water 4- Prevents a water pressure decrease from the dispenser 5- Drinking filtered water from your refrigerator can save you over $600 a year over using bottled water.