Limnology is a branch of ecology that studies the properties and structure of land waters. As a branch of ecology, the object studied in limnology is the unity of life in the ecosystem. Limnology is a branch of science that studies the nature and structure of land waters which include springs, rivers, lakes, ponds and swamps; both fresh water and brackish water. Limnology is a branch of ecological science that specifically studies water systems on the surface of the earth. Water quality, namely the properties of water and the content of living things, substances, energy or other components in the water. Water quality is expressed by several parameters, namely physical parameters (temperature, turbidity, dissolved solids, etc.) and biological parameters (presence of plankton, bacteria and so on).