Available shredded hardwood roots sizes Selection 1: Hardwood-roots mixed with pieces up to DN 100 and fine particles Selection 2 and 3: Separation of fine particles and big pieces out of section 1 Bigger pieces for bottom layer Selection 4: Section 1 shredded to fine particles fort he top layer We can produce any material you like to order by the use of certain grinders and star screens. We also offer you the complete logistic, installation and recycling of the Bio Filter Material supported by special machines like long front long-reach excavators.