Anybody know what this could be? I live in an apartment and this has been coming out of the water since last March but they said to run the water and it should go away, well it never did but now it seems to have gotten significantly worse. Now there’s chunks of black stuff coming out and it has already turned out bath black in some spots. It doesn’t come out in the sinks or shower head just the tub faucet. JUST BEFORE ANYONE COMES AT ME: My son does not bathe in this, I’m very paranoid about these things and I fill up his bath water with the shower head lol.