This product along with all of Syntec Pro's detergents only comes in 50lb and 400lb containers. This product is designed for just general cleaning of vinyl and aluminum siding. Syntec Pro actually makes a detergent that is specifically designed for mold and mildew removal. The detergent that I am referring to is model 2668-50. I posted a link below:
Syntec Pro House Mold & Mildew Remover