Bawo Ikomi

I have been researching on water probiotics to help improve pond water quality. I would need a recommendation on a water probiotic that works well with plastic/concrete fish ponds. Also what cheaper way can one makes a water liquid or powder probiotics.

Can we say potassium permaganate is a form of probiotic for fish ponds? It serves the same purpose of breaking down fish wastes, removing iron and other harmful bacterias and viruses in fish ponds.