this is the system we got... the cspro maxpac, and i love it... because we've had so much success with cs, we bought the smaller unit (cs300) from another manufacturer... although, i certainly would say to save the $ from the smaller unit purchase and put it toward the larger one, esp. if there will be larger qunaities needed... perhaps i should call the distributer with this question, but i don't want to buy my silver rods from him, as i've found a sourse for half his price...