70lb bags suck to try and throw around. Although not as much as 140lb bags.
I would recommend a peeler once you get above 600mm or so.
I may still have a line on an 800mm one in the Eugene area (I may not at this point). I never got to run it properly, and it will need some tweaks, but if it’s still around it is likely one hell of a deal.
Im having new controllers built locally that might also be worth your while. adds control of valves and a pump.
Whatever you purchase will have too small a motor and too small a VFD. unless you purchase separately, or have someone build it.
I like tangential drains. Delta uses them, so does at least one Chinese design (multiple manufacturers, not certain any of them spin the right direction!!).
See: Which way is this spun son?!?
I can be hired to solve this 