I've been keeping this old Pac-Fab (now Pentair) Challenger 2hp pump alive but I think I'm ready to throw in the towel. The easy button is to buy and replace in kind since it is all unioned up. I'm ready to go go something more 21st century. I have a Frankenstein setup with a Jandy Aqualink PDA-6, Hayward 400k heater and a Jandy Cartridge filter for a 12,000 gal pool/spa with a single water fall feature. Would like recommendations on pumps that will work with the Jandy PDA controller. Is variable speed worth the upgrade or should I go the plug and play route.