Ilovebass

Hello, I am new to this forum and I need help . I have just bought a Boss TU-3 Tuner and i just ordered a MXR Envelope filtrer(it's on his way) for bass. I didn't bought an adapter for any of them. I don't know exactly how this stuff goes. The both pedals are on 9V, so I need an adapter for 9V? On the box of Tu3 it says that it needs a PSA adapter. If I buy one, will it go with the MXR Envelope Filtrer ? If they are chained , the electricity will go in both of them? If someone can please explain to me this part of electricity I would be very grateful