That's exactly how it works.
This is the exact diffuser I have. I know the ceramic needs cleaned now and then but the tank hasn't had water in it for a week yet.
I pulled the pump out to check for blockage but it all looked good. I plan to take the diffuser apart Sunday just in case.
I also have a new pump coming that's going to triple my flow just in case the stock pump is just too weak for the diffuser.