Water filters come in all shapes and different sizes so first of all you should notice what kind of filter you need and if the size you're looking for is fit and meets your requirements or not. If you don't know how to change it then you should not worry we're always here to help you. Here I'm providing you a link where complete instructions are given about changing the water filter. So follow those instruction given in the link and you'd be able to change it. Click here to get the instructions.
