Reactor-11: Another unit of reactor, i.e. Reactor-2 was introduced in order to enhance the removal efficiency of the system. In Reactor-11 the biological component of the filtration unit was of more importance therefore the majority of the reactor volume was filled with earth¬worm and plant root zone layers. A rectangular plastic container of size (23. 5-inch lengthX 18-inch widthx 15-inch depth) was used to construct the second unit (Reactor-11) of vermin-filtration system. In Reactor-II there were two district layers: firstly, base layer (large pebbles; 10-15 cm in diameter and height about 6-inches), and secondly, top layer (small pebbles; 5-7 cm in diameter mixed with fine sand and height up to 10-inches). The top layer acts as bedding sub-strate for earthworms in Reactor-II. A thin plastic net sheet was placed between the both layers to avoid movement of earthworms from top layers to base layer of the vermireactor. Fresh and viable specimens of plant: Cyprus rotundus were planted in top layer and thin patches of small stones were placed over the open spaces around Cyprus plant to avoid direct hydraulic impact of inflow water in Reactor-II on plant stand and earthworms. The mean plant density in vermireactor was 0.14 plants/in.-2 (calculated using values of total surface area of Reactor-II and plant numbers in reactors)