Microbial population of pig dung and water hyacinth were determined on the first day until the end of the digestion process. The population of microbes mainly bacteria and fungi were determined by using nutrient agar for bacteria enumeration and potatoes dextrose agar for fungi and yeast. The temperature of the pig dung and water hyacinth was measured using a mercury thermometer calibrated in degree centigrade. The temperatures were determined every two days. pH of the pig dung and water hyacinth was determined at the beginning of preparation and subsequently during the digestion process. The pH of pig dung and the blended water hyacinth was determined by using Jenway digital hand pH meter.