So, at the restaurant where I work we use a food grade sanitizer called Santimine 150 (chemically it's half dimethyl benzyl ammonium chloride monohydrate, and half filler). It is used as a sanitizing bath for equipment, pots, etc after the wash and rinse baths (if you are familiar with a standard three basin restaurant sink, this is what would be in the third basin). No rinsing necessary, instructions just say use one tablet per gallon of water.
Any reason I shouldn't use this to sanitize beer equipment? It'd be a whole lot cheaper to just grab a couple tabs from work occasionally than shell out for Star-San or Idophor.
Googling has led me nowhere. Someone with more experience or chemical knowledge than I care to weigh in?