Originally Posted by GoldfishJoey
Question on the overflow box... What does it do necessarily? Is it just syphoning the water from the aquarium to the sump? The only reason why i am questioning an overflow box is because wouldn't a canister filter be useful in a sense? For example... If I kept the intake bar in my tank where it's at and I placed the spray bar in the sump and placed a return pump inside my sump to the tank. Wouldn't it be doing the same thing? Granted I'd be using the canister filter as extra filtration or just as a water circulator. Does that make sense? I mean I'm utilizing the things I currently have rather then making more of a mess. Is this possible or does it sound like a headache ?
Sorry for the bad drawing but can you see what I'm saying? Or if you need water to just be skimmed off the top I could just reverse the tubing of the spray bar in tube. What are you thoughts????
In addition to what Mrc said, if you have a power outage in that configuration, you'd actually creae a siphon through the canister filter until the siphon broke at the canister filter intake, likely overflowing your sump.
As far as the Eshopps v. CPR, I've heard good things about both. I've used one that looks a lot like the Eshopps version on my 37 for years with no issues. I beleive you have to use some kind of pump on the CPR version like an aualifter or powerhead with a venturi to maintain siphon.