Product review (5 stars): check this if you have filter problems
i bought the new everydrop filter and not water came out.  i reinstalled the old filter---no water.... i looked into this housing (old one) and could see one of the two nipples pointed down.... they open the valves when the filter is inserted---i guess after 8 years the plastic degrades and the valves fail.  i replaced this theough the front grill area in about 15 mins and it solved the problem