Four biofiltration units, which consisted of a glass aquarium of
75 L (50 cm length, 50 cm width and 50 cm height) capacityfitted
with 20 PVC pipes each of 30 cm length and 5 cm diameter having
several pores of 27 mm diameter to enable liquid exchange, were
configured (Fig. 1). During present experiment, P. australisandT.
latifoliaplants of 35.172.1 cm length and 45.570.5 g fresh weight
were selected and placed individually in each PVC pipe.