Backyard Aquaponics
A place to discuss aquaponics

If you could find it the patent would give an good idea of the internal workings.. just for curiousity of course.
The shape of it reminds me of a ww2 air raid siren

I have a small Jabsco positive displacement pump. Has a rubber impeller that compresses due to the internal pump shape. Looks like a king sized version of that. Works at almost any speed.

Hey DanD
Try a proffessional hardware store that sells spare parts for compressors and cement mixers, they may have pullys of either of these. They will also stock belts for them. Alternativly try a bearing supplier (as in ball bearings) There is one near me that sells pullys and belts, but i'm not near you