Tender For providing of annual maintenance services for water purification and conditioning system (version 2) - potable water purification system reverseosmosis or uv based; upto 3; package-5 : water purifier and conditioning system maintenance involving basic servicing, ..,annual maintenance services for water purification and conditioning system (version 2) - uv water purifiers; upto 3; package-3 : water purifier and conditioning system maintenance involving basic servicing plus maintenance of filters and and membrane..