Thank you for the help i plan to do the same type of thing If I understand correctly using a 4 way I don't need individual ball valves or gate valves per outlet as the 4 way alternates flow but it would be a good idea to use valves if I just striaght pipe it from the CL pump??
Where did everyone buy their OM 4 ways??

I only put ball valves before and after pumps to make removing them for cleaning easier.

I bought my 4-Way used locally.

you only need ball valves on the outputs if the 4way was under the tank, since your over the top, you don't unless you're want to limit the flow in one or more of the lines.