From where should graywater be sampled?
For those vessels which must sample graywater (e.g., Cruise Ships), graywater samples needed to demonstrate the effectiveness of the treatment system must be representative of the treated effluent to be discharged, and must therefore be collected after treatment and prior to the discharge into waters of the US. This sampling point could be from a sampling port in the vessel piping or, if feasible, from a discharge port located above the waterline.
