An apparatus and method for the biological treatment of water using algae comprising a support frame for flat, two-sided LED lighting-panels and flat, two-sided algae turf plates, an axle, the flat, two-sided LED lighting panels and flat algae turf plates are arranged as spokes radiating from the axle in an alternating panel so that each side of each two-sided lighting panel faces and illuminates a side of a flat algae turf plate, the algae turf plates being removable from the support frame so that the collected algae can be removed from each side of each the algae turf plate.