Water Arts Consulting   

Beneifical bacteria in a pond is a naturally occuring process in the development in the pond's ecosystem.  The primary emphasis in beneficial bacteria is their critical role in providing biological filtration & insuring the water parameters stay in a good range.

Secondary benefits may also include the ability to compete for nutrients that would otherwise be consumed by algae.

Hint:  Not all beneficial bacteria are the same!  Companies & brands all have their own methods & only few actually manufacture their own.  Simply by throwing different strains together will not insure success or capability of doing what it was originally intended.