Home » Tender for Supply Of Sand, Pebbles, And Gravels To Be Used As Filter Media In Cooling Towers And Effluent Treatment Plants. Sand Of Size 0.6mm To 1.2mm, Gravel Of Size 5mm To 7mm, Pebbles Of Size 50.8mm To 38.1mm, Pebbles Of Size 38.1mm To 19.05mm, Pebbles Of Size 1, India