The present experimental study has highlighted potential operation problems, associated with the fibrous nature of the sludge. In particular, there is a tendency for material to accumulate at restrictions in the flow path, i.e. valves etc., and hence lead to blockages. The possibility of blockages developing is also a concern voiced by Durban Corporation personnel. Hence, it would be necessary to engage in further engineering development on a full-scale plant in order to identify and eliminate regions in the flow path that could encourage the formation blockages. Other hardware aspects that need to be investigated include the choice for the cleaning method. These would have to be addressed on a full-scale plant.