We bought the house with the fridge included and didnt even know it had an external water filter until a kickboard dislodged to reveal the inline filter under a kitchen base unit

This is our first experience with this kind of filter and after moving it to a more convenient position the replacement was extremely simple just push in the plastic supply hose replace the clip flush the filter through there was a small amount of discoloured water which was expected according to the instructions and then reconnect the fridge hose and flush the complete system from the fridge end