First fix pipe size?

[Luggsey]

Thank you, I remember the pump had to be a bronze impller to combat that. Can I use copper teturn or will that suffer from oxidation or whatever process causes problems?

 

[ShaunCorbs]

Copper or mlcp are the only ones approved

 

[Luggsey]

Copper or mlcp are the only ones approved

I planned to fit the pump next to the tank it returns to making the return run only short. Does that sound ok?

 

[ShaunCorbs]

Yep that sounds ok with either copper or mlcp