questions: query regarding diseases of polluted water and treatment of bacterial septicemia. 
 answers: apply lime (quick lime)-10-13 kg/bigha/month, use 4-5 ppm (mg/lit) potash to disinfected the pond water. 
treatment of bacterial septicemia- 1ppm potash. 3 gm of tetramycinr per kg feed for 8-10 days.