Comment by verelo

To play the devils advocate here (and to be frank, i think people should be able to use compatible products), it's possible the manufacture is concerned that products they didn't make could cause an issue. I.e. filter is too restrictive and burns out the pump. Then the fridge comes in for warranty repair and there's no way of proving what caused the issue. From the perspective of the manufacture, i kind of get it, but i still think there has to be a better middle-ground than it stops providing a service.