Both their CNS17 and Pro lines work well in other Hydroponic systems, I dont know why it wouldnt work in the MPB system. If price is your concern, you would be surprised how Pricey a seemly cheap brand can get one you add everything up and if you are using all of their additives. A more seemingly expensive brand looks pricey on the outset, but some times can be around the same price with better results.
Best of luck
Bezy