Tender For corrigendum : providing of annual maintenance services for water purification and conditioning system (version 2) - potable water purification system reverse osmosis or uv based; 3 to 5; package-5 : water purifier and conditioning system maintenance involving basic servicing, ..,annual maintenance services for water purification and conditioning system (version 2) - potable water purification system reverse osmosis or uv based; 3 to 5; package-5 : water purifier and conditioning system maintenance involving basic servicing, ..,amc of integrated security and surveillance system - repair and maintenance of cctv and surveillance system in the residential school for entire campus; non-comprehensive; hardware, software, wireless system; cost of consumables to be provided to se..,amc of integrated security and surveillance system - repair and maintenance of cctv and surveillance system in the residential school for entire campus; non-comprehensive; hardware, software, wireless system; cost of consumables to be provided to se..