Photo attached. Nothing in terms of a manifold or mixing device that I can tell. It looks like the water goes into the manifold, through the strainer, to the pump, and then from there the line splits with one branch going to the hot water heater. I'm not sure the white stuff is able to make it past the strainer, which is I why I'm not sure it's the same problem. As you can see from the picture, the white stuff is kind of big. I think I need to just disconnect the water line where it goes into the tank and see if that is free. If it is, then disconnect it where it leaves the tank, and see if that is free. And then just follow the line from there until I find a clog. I'm worried the hot water tank is bad and the problem is inside the tank.