My wife and I just bought a house, and I noticed after using the shower, there were black specs all over the shower floor. There is a seam where the bottom part of the shower joins with the wall covering, and there is no caulk. I sprayed water into it, and a nearly endless stream of black and yellow specs poured out. Should we remove the enclosed shower and check for mold? Some people online claim that this is soap scum, but there are a lot of seams in the shower without caulk so I am concerned it could be mold.
This what was coming out at the hour mark. Here is a video: https://youtu.be/PW_0p61zcHY