[Myka]

J&L has the Poseidons, not sure who else. Mine is one of, if not thee quietest pumps I have ever been around. Pricey though.

Consider buying a dosing pump instead of a calcium reactor. Seems to be the latest trend. Takes up less space, and less pieces to break or break down. You can save yourself a few bucks and buy a dual doser instead of a triple and manually dose magnesium. I find I rarely have to dose magnesium in my tank (provided I do regular water changes), so I find it a bit pointless in my case. Not sure how much other people need to dose magnesium.