annual cleaning contract for water storage tank annual cleaning contract for water storage tank , cleaning of water tank of having capacity as given below to store water (under ground/ over head ) in the university campus with vacuum pressure pump system & also using the necessary chemical (such as potassium per magnate) & treatment to clean the water tank & from tank complete as directed by engineer in charge , over head pvc tanks are as followinga) upto 200 ltr. b) upto 500 ltr. c) upto 1,000 ltr. d) upto 2,000 ltr. e) upto 5,000 ltr. f) upto 8,000 ltr. , under ground water storage tanks are as g) upto 10,000 ltr. h) upto 15,000 ltr. i) upto 20,000 ltr. j) upto 50000 ltr. k) upto 100000 ltr. l) upto 150000 ltr.