bids are invited for custom bid for services - maintenance of 3000 lph ro plants for a period of two years in den/north/hyb jurisdiction repair, maintenance and installation of plant/ systems/equipments sand media (once in a 3 months) carbon media (once in a 3 months) cartridge filter every week (once in a week) membrane (yearly once) roto meters (yearly once) dosing pump (yearly once) pressure gauge (yearly once) tds meter (yearly once) dosing chemical (antiscallant for ro plan) for every day test reports for water analysis (once in a week) calibration report for tds meter (for every three months) calibration report for ph meter (for every three months) membrane chemical washing (every month) electrical, piping, rw pump, hp pump, connectors, valves and mpv minor repairs, including painting and maintenance (every month)total quantity :