The ice cubes when they melt, you can see white floaty stuff in the water.  If you get a glass of water from the refrigerator and freeze it, than let it melt, they same thing happens, white floaty stuff.  Have tried changing the filter every 4 ,months, same results.  Have to use a zero water pitcher or bottle water to make ice cubes or drinking water.  The filters are to expensive to change every month and not sure it would work anyway.