bids are invited for annual maintenance services for water purification and conditioning system (version 2) - 500 lph; 5 to 7; package-5 : water purifier and conditioning system maintenance involving basic servicing, filters, membranes, all electrical parts including pum.. , annual maintenance services for water purification and conditioning system (version 2) - 100 lph; 5 to 7; package-5 : water purifier and conditioning system maintenance involving basic servicing, filters, membranes, all electrical parts including pum.. , annual maintenance services for water purification and conditioning system (version 2) - 250 lph; 5 to 7; package-5 : water purifier and conditioning system maintenance involving basic servicing, filters, membranes, all electrical parts including pum.. , annual maintenance services for water purification and conditioning system (version 2) - potable water purification system reverse osmosis or uv based; 5 to 7; package-5 : water purifier and conditioning system maintenance involving basic servicing, .. , annual maintenance services for water purification and conditioning system (version 2) - 1000 lph; 3 to 5; package-5 : water purifier and conditioning system maintenance involving basic servicing, filters, membranes, all electrical parts including pu..