building a 480 total volume system and would like to install the smart high output UV 80 watt sterilizer by pentair aquatics. dose anyone know if i can buy one external DC pump that can run as low as 450GPH and up to 3000GPH? OR can I install a VFD for ac motors with a large pump. I am building this tank with the hammerhead/barracuda 6000/4590gph and if I could run a VFD I would just buy a second one (I could use it as a back up incase the main fails). or could i use a gate valve to restrict flow? Thank you for the help