CarlD- or Poconos-

Could you please explain why a 2speed pump is better than a one speed?
What are the advantages?
And what does head size mean?

Webfeet, not trying to highjack your thread, but we might in the same boat here, I don't know anything about pumps/head/speeds ect. either. And we are looking at getting a very similiar pool to yours.

Thanks
~Hoffmans