OK, My volunteer Pat found the correct manual. I don't know where, because I didn't see this one when I looked! This manual was in better condition so we scanned the full 50 page document. The document was too large to attach here so if anyone would like a copy I can always mail or email it.
The document is:
Instructions for Installation, Operation, & Maintenance of
450 G.P.H. Diesel Fuel Oil Purifier
250 G.P.H. Diesel Lubricating Oil Purifier
SS212 - SS227, SS240 - SS264
SS265 - SS274
SS228 - SS235, SS275 - SS280
SS236 - SS 239, SS281 - SS284