Tender For supply of coarse silex 4 x 8 , coarse sand 8 x 16 , fine silex 16 x 32 , activated carbon iv , softner resin 220 na , 40 nb top mounted , membrane cleaning chemical , jumbo wound cartridge , jumbo spun cartridge , micron slim spun cartridge , ultra filtration bag filter , ultra filtration membrane cleaning chemical , ultra filtration membrane , ro membrane housing end cap assembly , post micron filter