Trying to pick the right return pump

[sphelps]

When estimating head pressure you should multiply the vertical height by at least 1.5 to take friction and minnor losses into consideration. A factor of 2 is typically what I go with because over time the pipes become dirty and rough which adds significant friction.

So if you have 4 feet from sump level to display level you should estimate 6-8 feet of head pressure.