Pump with plumbing. Got all the PVC
from menards. Boy, I stood in that isle contemplating things for like an hour. Plumbing is complicated!
I'm using a danner mag-18 as the pump. The white piece above the pump is a 1" check valve that will prevent back flow in the case of power loss. Above that is a ball valve to regulate flow. Finally, the T that sends water to 0.75" inside diameter tubing to the tank returns.