Gem Bids For Cleaning Of Sewer Tank By Diesel Running Vehicle Mountinghydraulic Operated Sewer Cleaning Machine, Taking Out Thestone & Sand From Filter Media Tank Manually/ Mechanicalmeans And Refilling Again, Supplying Filling Spreading &leveling Stone Boulders Of Size 5 Cm To 20 Cm In Stp Filtermedia Tank, Supplying Filling Spreading & Leveling Gravels Ofsize 5 Mm To 10 Mm In Stp Filter Media Tank, Supplyingfilling Spreading & Leveling Coarse Sand Of Size 1.5 Mm To 2mm In Stp Filter Media Tank