day to day cleaning of water storage tanks at different locations by mechanical method at rtu kota ( a . r . c . ) , mechanised cleaning of storage tanks comprises of following 6 stage as mentioned below . ( 1 ) mechanical dewatering . ( 2 ) desalting removal of leftover dirty water and sludge with sludge pump . ( 3 ) cleaning of wall , ceiling and floor by high pressure water jet with help of equipments which creates a pressure of 100-150 bar . ( 4 ) removal of remaining sludge from floor with the help of industrial vacuum cleaner . ( 5 ) spraying of non toxic , bio degradable ecofriendly and bacterial agent certified by a govt . approved laboratory to disinfect the tank from all harmfull pathogens . the does should be safe as per the uced guidelines & 23 adopted on 17th december 2001 . ( 6 ) treatment if inside tank by exposing uv radiation to kill further suspended or floating bacteria if any . , capacity upto 500 ltrs . , capacity upto 500- 1000 ltrs . , capacity above 1000 ltrs .