Dale,

MAG's aren't pressure rated. Personally I'd go for the MAK4. They are pressure rated. Run a beckett great and consume a LOT less power. 1/2 to 1/3rd the power consumption.

Often the decision here comes down to whether your sump is drilled or not. I have to use a submersible pump as I don't have any holes to run an external pump thru!

I run my huge venturi skimmer with the intake for the pump as a U over the sump. I just upsized the tubing on the U to 1.5" and it shouldnt restrict the pump what soever. Just another opinion :biggrin:

Jon, what happens if the power goes out? Don't you lose prime?

Not if the pumps below the water line.

OK, but how did you get water in the pipe in the first place?

union

OK, what about air bubbles? Wouldn't they break the suction? Sorry for all the questions, I just didn't think that would work (not well, anyway)

If you have enough flow air bubbles wont be a factor, they wouldn't be there long.

Clinton

what bubbles? As long as the pumps low enough and enough water remains in the pvc then she just fires back up again. My returns are done this way.