Hypothetical reef tank

[mr_alberta]

There's got to be a Mech. Engineer somewhere here that can explain why you don't need ball valves on a closed system like a Calfo Manifold...

Originally Posted by christyf5

Uh, pardon my ignorance, but do you have to provide an "excess" of flow so that water makes it through to the final outlet at the end of the line (so that you don't have the most pressure coming out the first outlet, then less at the second, even less at the third etc?).