Hob Closed Loop Overflows

[reefmaster]

what is a HOB CLOSED LOOP SYSTEM? I have 2 300gph HOB overflows now, am looking for a better setup as far as hob overflows go any suggestions?

 

[ecobalance]

cpr

CPR makes a 1600 gal an hour,or you could just get a new aquarium with an internal one.A closed loop is something different

 

[Reefdaddy1]

I beleive your refering to a calfo manifold. It does hang over the back but there many versions. Here is one.

http://www.advancedaquarist.com/issues/sept2003/short.htm