The document evaluates the physio-chemical parameters of water from Kolleru Lake in India for drinking purposes. Water samples were collected from various locations in the lake and tested for parameters like pH, turbidity, hardness before and after treatment with rice husk charcoal. Treatment with rice husk charcoal helped decrease turbidity and pH but did not completely neutralize hardness or change chlorine content. While natural materials can help purify some aspects of the water, the study found that lake water would still require further treatment to be considered safe for drinking.