Experimental studies have been carried out to develop a low cost system of waste water treatment. The system uses, besides a solar water heater, cheap easily available materials like lime sand, gravels, straw and charcoal. It removes solid materials, color and odors-producing materials, and water borne pathogens from waste water and make it suitable in different purposes. Here, we also isolate a Pseudomonas strain from cow dung and it is also used to treat the different impurities of waste water.