Product review (5 stars): take the old filter out and change the filter because I've had a fridge that somehow gotten something in the interior of the fridge and no matter what the repairman did the water was horrible. With these economical filters it's not to bad ...
Changing the filters in the fridge is very necessary. I live in the city where they have waterline  breaks every once in a while. I buy the multiple packs of filters and if I have brown water coming out of the faucet, I know to dump all the ice, take the old filter out and change the filter because I've had a fridge that somehow gotten something in the interior of the fridge and no matter what the repairman did the water was horrible.  With these economical filters it's not to bad to change them whenever needed and not have to worry about nasty water.