bids are invited for testing service for on-board /commissioned equipment/ instrument related to plant - repair testing and commissioning of the water treatment plant; activated carbon filter including removal of existing filter media, cleaning of internal components, re.. - servicing of activated carbon filter (acf) including removal of existing filter media, cleaning of internal components, refilling, testing, and commissioning complete as required. , providing and fixing multiport valve for activated carbon filter, complete with all fittings, accessories, testing, and commissioning as required. , providing and fixing pvc strainer complete with all accessories, testing, and commissioning as required. , providing and filling filter grade silica sand media in filtration unit, complete as required. , providing and filling activated carbon media (minimum 600 iv) in filtration unit, complete as required.