annual repair maintenance of residential non residential buildings at regional centre nsg rajarhat kolkata during 2020 21 sh comprehensive maintenance of 1000 lph ro plant 250 ro plant , comprehensive maintenance of 1000 lph ro plant , including replacement of parts a ) all consumable items such as i ) micron filter cartridge ii ) antiscaling chemical iii ) ph boosting chemical b ) other spare parts replacements will be depended on the condition of the existing working condition of the equipment . c ) ro membrane one set will be replaced during the contract year if required d ) high pressure pump & raw water pump service & repairing etc . e ) providing water test report of raw & filter water twice in a contract year . , comprehensive maintenance of 250lph ro plant , including replacement of parts a ) all consumable items such as i ) micron filter cartridge ii ) antiscaling chemical iii ) ph boosting chemical b ) other spare parts replacements will be depended on the condition of the existing working condition of the equipment . c ) ro membrane one set will be replaced during the contract year if required d ) high pressure pump & raw water pump service & repairing etc . e ) providing water test report of raw & filter water twice in a contract year . , providing & fixing of additional chlorine dosing pump in existing ro plant 250 lph & 1000 lph as per water test report . complete in all respect as per direction of engineer in charge .