Left: The assembly line for the popular PH model head pump. Right: Raritan is well known for products other than sanitation
systems; the company’s water heaters can be found aboard thousands of cruising vessels.
Approved MSDs: There are three different types
of MSDs that can be certified by the U.S. Coast Guard
to meet the requirements in 33 CFR (Code of Federal
Regulations) Part 159, each having its own design, certification, and discharge criteria. For more information, see
33 CFR 159.53.
• Type I is a flow-through discharge device that
produces effluent having a fecal coliform bacteria
count not greater than 1,000 per 100 milliliters and no
visible floating solids. This type of device is typically
a physical/chemical-based system that relies on
maceration and chlorination. Type I MSDs are issued
a Certificate of Approval.
• Type II is a flow-through discharge device that
produces effluent having a fecal coliform bacteria count
not greater than 200 per 100 milliliters and suspended
solids not greater than 150 milligrams per liter. This
type of device is typically a biologically or aerobic-digestion-based system.
• Type III is a device that prevents the overboard
discharge of treated or untreated sewage or any
waste derived from sewage. This type of device is
typically a holding tank and may include other types
of technology, including incineration, recirculation,