A commonly cited concern in relation to the use of trees within bioretention systems (for both Filterra and ‘conventional’ bioretention systems) is that trees will result in root ingress (and blockage) of under-drainage. Ocean Protect have prepared a short document here to review this claim.  It is hoped that this document will assist designers, developers and regulatory authorities considering the potential use of trees within bioretention systems.  Please contact us if you would like to discuss further.