The physico-chemical parameters (pH, DO, BOD, COD, K, P, N, oil and grease, metal contents etc.) of POME & CME need to be determined b4 ur study their effects on E. crassipes & P. stratiotes. The physico-chemical characteristics of the soil/sediment where they grow is also important if u have the required funds. lastly, the effects on plant growth parameters shd be determined