The treatment system described above is a three tier system with minimum discharge (or with zero discharge) of waste water. The sludge accumulated in the settlement pond is composed of excessive organic matter and nutrients and can be used as a fertilizer for plants. The maintenance of the gradient would mainly depend on the location, otherwise pumping will be essential, which would entail an additional expenditure. 

ETS for Shrimp Farms of 5.0 Hectares and Above
The ETS described above is most suitable for the treatment of waste water from farms having a water spread area of 5.0 hectare and above.

ETS for Small Cluster of Shrimp Farms Varying Between 1.0 to 2.0 Hectares and Less than 5.0 Hectares
For small farms having less than 5.0 hectare water spread area, setting up of a common ETS depending on the total water spread area (10% of the total water spread area) is suggested. In this case the construction, operation and maintenance cost will be shared depending on the quantity of the waste water generated or on the basis of the farming area owned by the individual owner. While sharing the common ETS facility, care should be taken to prevent the spread of disease/infection while recirculating the treated wastewater.
If adequate space is not available for setting up of the treatment facilities, the Government may take steps to bring in the small farms (i.e. less than 5.0 hectare water spread area) located in a particular area under an umbrella organization/co-operative society/group of farmers and assist in procurement of land required for setting up of the ETS.

Monitoring of Water and Sediment Parameters
Wastewater and sediment quality parameters are generally not monitored by the farmers. To keep a record of the water and sediment quality, it is necessary to monitor before and after the treatment and also at regular intervals. This would also assist the farmer in standardising his practices.
For this purpose the farmer can take the help of State Pollution Control Board or laboratories recognized under the Environment (protection) Act, 1986 to get the samples analysed. The larger farms can also set up their own laboratories for conducting routine analysis.