Deccan Water Treatment Pvt. Ltd. Manufactures Car Wash Effluent Treatment and Recycle System. Deccan Water Treatment Pvt. Ltd. Is an ISO 9001:2000 certified company. The Car Wash Effluent Treatment and Recycle System are used to prevent staining in cars and vehicles. The Car Wash Effluent Treatment and Recycle System wash away mud and dirt, oil and grease, organic matter causing smell, etc.