Power filters to RUGF (or RFUG?)

[Andrew McLeod <thefish at theabyssalplain_freeserve.co.uk>]

Is it possible to use a power filter, such as a Fluval 3 Plus, for example, 
to power a reverse undergravel filter, or is the pump insuffucient? But if 
it was not powerful enough, could the power filter be used as a mechanical 
prefilter (with fine filter media as an extra in a Fluval 3 Plus), and then 
a powerhead drive its output through the UGF to allow a small power filter 
to drive a tank of a large capacity than its rating (due to the increased 
biological filtration)?
I know this isn't strictly a plant question, since plant tanks seem to need 
less filtration anyway (?), but it would be very helpful.

--
Andrew McLeod
thefish at theabyssalplain_freeserve.co.uk