What is true of a Ndz?
Just so, what best describes a marine sanitation device? Electro Scan (foreground) and Thermopure-2 (background) type I marine sanitation devices. For purposes of the CWA, an MSD is "any equipment for installation on board a vessel which is designed to receive, retain, treat, or discharge sewage, and any process to treat such sewage." 33 U.S.C.