WTB - Diatom Canister Filter

Are you talking the really old school units that you have to add the diatomacious earth( white powder)to? I bought one used in 1980 i think, not sure if it even works anymore but i can check.
 
Ideally I would like to try and find something like a magnum or vortex that holds a micron filter cartridge or sock. Nothing too fancy. They run 60-80 bucks at petsmart. Figured if I could find something used I would jump on it.
 
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