Its basically just connecting an external water pump to the outflow tube of the canister filter and using it to power the filter instead.
This diagram for the Aquael system shows how it could be setup to work (look at the 2nd configuration whereby the external pump is installed on the outflow hose):
Photo from Google Images.
You can buy external water pumps from most LFS... here is an example of a 1,000 l/ph external water pump from East Ocean:
Photo source and product link:
http://www.eastoceansg.com/hailea-hx...mp-p-1554.html
The listed power consumption for this particular model at 35W is high though.... i guess you could shop around to find other external pump designs too.
Anyways, just connect it inline on your outflow hose and use it to run the canister filter. Just make sure to remove the Eheim canister filter's own impeller to reduce resistance (since its not being used).
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