The water surfaces of T1 and T2 were almost completely covered
with the plastic netting bags of the sliced water hyacinth stalks.
Water hyacinth with an average height of about 30 cm (including
leaves and stalk) were placed in T3 in late March 2008. They covered
less than 1/10 of the water surface, and did not grow well until
June. By mid-July, the plants reached a maximum height of
about 70 cm forming a dense mat over the entire water surface
in the tank.