Activated carbon can be ...
Published by Mariam Ganji, Head Of Technical Department at Avijeh Palayesh
Activated carbon can be processed from natural materials like coconut shells or... you may probably mean something like this by natural.but as other members emphesized there is probably something wrong with the pretreatment of activated carbon filter because its main application is for absorbing organic matters (VOC,colors,TOC,...)not sediments,TSS and alike