Product review (5 stars): replacement housing for Frigidaire water filter.
We couldn't figure out why water was leaking into the refrigerator.  The problem seemed to coincide with the food in the refrigerator freezing.  Once we thawed the food and lowered the cooling setting on our refrigerator, the leak started.  Finally figured out it was a cracked housing on the water filter.  I am guessing that the water froze in the filter and expanded enough to break the housing.  I ordered the replacement part online, it showed up in a few days, easy to replace, problem solved.