a 2 year filter? if that filter is not made of metal and back flushes, one only can wonder how on earth it could filter water. the water would have to be extremely purified before it entered the filter, or the filter so worthless the water easily goes through it, with all its chemicals.
this makes a shower filter even sound silly, because a 'real" filter would catch the water first and not let it out fast and no one would want a slow shower.