Big mechanical prefiltration for large setups/systems or ponds. I was running 9k-10k gallon per hour through it on one of my ray systems. Just replaced that system with two 1k gallon systems so this is no longer needed. Works fantastic and has all pieces from the factory included.
asking $500 OBO (retail is $1,600). There are two holes drilled that you can run either open or closed, they are for more flow but do not effect the filter in any way.