Product review (1 stars): Black stuff from water dispenser after replacing filter
Attached filter to my Whirlpool refrigerator.  Started running the gallon of water through it to clean it out.  Black stuff in the water came out of the water dispenser.  I assume it was charcoal, but I don't know for sure.  I've replace the filter several times on this refrigerator and never had this happen.  I sending it back and ordering a different one.