Can someone give me the step by step procedure for using the Macerator pump for holding tank draining.

I want to try it out and practice, before the need arises.

How long of a hose can one use?

Does the pump produce much head?

What maintenance is required? Is periodic use enough?

I have heard that the pump should not be run dry. If that is the case, how does one know when the tank is empty and to turn off the pump.
Wouldn't looking for the flow to stop at the hose end be catching it too late?

How do you clean the discharge hose in a way not to contaminate the potable water tap?

JIM