yes, in saying that, i find the fx5 gruntier... i was referring to cheaper chinese stuff, not eheim, eheim is definitely very efficient.
fx5 value for money vs water crankput (new word i made up) vs initial cost vs capacity
fx5 has so much power in terms of turn over, mech filtration is awesome, clarity is good.
but yes, if you look at power, then over 24/7 cycle, 1x fx5 to 1x eheim ... eheim wins...
but i think fx5 will filter more.
also, initial purchase price, you can get 2x fx5... make sense?
i gu3ess depends on the tank.
eheim is really focused on extreme bio filtration.... not turn over as such looking at the capacity of the filter as well, can contain more bio media.