When considering this type of product, you should also take a look at PetZONE from Interlink Supply. It is more concentrated than OSR so you are less likely to get white powder residue. PetZONE also adds some hydrocide.
With any of these type of product, the hotter the water, the better the results.
I bought a whole case of Matrix Miracle. I used the whole case over time on several different situations and over time determined that the product isn't worth a nickle.