Ok the place i purchased the pumps from was as follows: http://stores.ebay.com/cdesurplus

I have gotten better turn over due to the higher flow as well as monitoring the O2 content in the water. The pump is not a rotary vein pump. I am now using the rocking piston type pump with dual pistons and it can pull up to: 22-24"HG and open flows 3.0 - 5.0 CFM and can handle Pressures up to 50psi intermittently and 30-35psi Continuous duty.

It runs cooler and quieter than the previous pump.

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1/10 - 1/4 acre pond plus 16 ft deep/ Plus 40 ft by 20 ft by 6 ft deep koi and fathead minnow pond next to it. Upstate NY