So once in awhile when my gf is running a bath, black shit comes out of the tap and into the tub, theres small chunks of black shit, I originally thought its pieces of carbon like what you would use in a fish tank.
When i pressed on the black chunk it smeared and felt kinda oily. Does anybody know what it is? It seems like it happens when we use hot water. Do you think my water tank has some crap built up inside? This townhouse was built in 2006, so the water tank isnt too old.
Any help would be appreciated.
Thanks