A:
Dear Valued Customer:
Thank you for your inquiry regarding Whirlpool refrigerator water filter 4396841.
How ofter you change the water filter depends on the hardness and mineral content of your water and how ofter your water and ice is used.
Most models will have a light to remind you to change the filter after so much time or after so many gallons have gone through the filter.
Depending on the variable above, it could be every 3-6 months typically.
Thank you again for your inquiry. We appreciate and value your business!