I bluit mine out of PVC plate and pipe. I have no pipe, but I have the plate. Let me know if your interested in looking at my design. I could hook you up with enough PVC plate to build one like mine for no charge.
I recently built one. My design is a bit different than c_stowers but works on the same principle -- using the auto topoff pump to stir the kalk. I think mine is a little more spendy (around $70 in parts). It's been going for a couple of weeks now and seems to be working well. Here is a link:
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