CROCLIST: External Pump/Filter

[Donny]

I would like to build a external canister type pump/filter that can be located outside of animal enclosure.

I am thinking a a 5 or 15 gallon plastic bucket or drum and 1 inlet from the pond to the bucket and 1 outlet from the bucket to the pond .... inlet/outlet would be pvc and or rubber tubing.

I would also like to add heating eliment to the pump/filter, I was thinking one or possibly two 250watt stealth aquarium water heaters.

Can anyone give me some ideas and or pointers on designing this, it doesnt seem like it will be to hard but still id like to get it right and get it the best I can the first try.

What type of pump should I use, will I need 1 or 2 pumps, 1 to get the water from the pond to the bucket and 1 to get the water back to the pond ..... or can this be done with 1 pump

The pond is only about 150-200 gallon (estimated) 

I originally installed PVC tubing for a drain which I dont really even use, I was thinking this could be used to move the water from the pond to the bucket

I would like to keep cost to a mininum and use supplies that I already have if possible, stealth heater(s) and pond pumps

Ideas, first hand accounts and suggestions would be appreciated
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