Closed loop systems have the "overflow" and "return" plumbed directly to the pump and are always submerged/in a state of "syphon"? Is this correct? Having a closed loop system has nothing to do with filtration correct? I have seen people keep the closed loop pumps underwater, but that is just for cooling and noise right?
What are the advantages of such a system and do most people also run a sump in conjunction with closed loop? If that is the case is the closed loop just acting as a wave maker?
What are the advantages of such a system and do most people also run a sump in conjunction with closed loop? If that is the case is the closed loop just acting as a wave maker?