Don't know. Hard to tell without testing. I did see something interesting in the HardOCP forum tonight. I saw to 802 power heads in a res. One pushing and one pulling.
Whats great about them is they are both 400gph pumps. They can have there flow reversed with a flick of a switch. I have 2 in my 150 gallon fish tank and they just simply rock. They have to pull water up almost 2 feet in my tank and there pushing alot of water. Atleast 100gph. Hard to tell with out a flow meter, but its not below 100.
I may go buy two more. Can't take them out of my fish tank or I would loose alot of money from my fish dying. Either way it may work well, but like anything in life its all about trial and error.
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