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Sep 25, 2008
7,096
Alden 50 Sarasota, Florida
holding tank pump

commonly used to pump the contents of a holding tank, it is a simple pump but includes what is essentially a garbage disposal blade to grind up the waste before discharge
 
Sep 25, 2008
7,096
Alden 50 Sarasota, Florida
holding tank pump

commonly used to pump the contents of a holding tank, it is a simple pump but includes what is essentially a garbage disposal blade to grind up the waste before discharge
 
Sep 25, 2008
7,096
Alden 50 Sarasota, Florida
holding tank pump

commonly used to pump the contents of a holding tank, it is a simple pump but includes what is essentially a garbage disposal blade to grind up the waste before discharge
 
Dec 2, 1997
8,729
- - LIttle Rock
A macerator is essentially a blender blade

A macerator is not a pump, but a "chopper" blade IN a pump. They're installed in electric macerating toilets and in pumps designed to dump a holding tank at sea. The macerator pumps designed to dump a tank are usually referred to as just a macerator. The actual pump, whether in a toilet or in an overboard discharge pump, is typically an impeller driven pump. An impeller gets its name because it impels liquids through the pump. You can see an exploded drawing of the most common macerator pump here: http://www.jabsco.com/files/18590_series_sealed_macerator.pdf There are two other types of pumps--manual diaphragm pumps and electric diaphragm pumps. They don't macerate (puree), only move liquids through 'em. Both impeller pumps and diaphragm pumps--manual AND electric--are used for many applications...fresh water pumps, bilge pumps, engine water intake pumps, fuel pumps, toilets and dumping holding tanks overboard.
 
Dec 6, 2005
47
S2 8.0 c Chesapeake City, MD
Pump Out

So it purees the solids so they can be pumped out. I saw a boat described w/macerator and Y valve. When can you pump overboard? Being on the Chesapeake my guess would be never :) I guess it would only be useful for blue water cruising?
 
May 25, 2004
958
Hunter 260 Pepin, WI
The Law

Congress enacted the Clean Water Act of 1972 (amended in 1987). This law addresses a wide spectrum of water pollution problems, including marine sewage from boats in navigable U.S. waters including coastal waters up to three miles offshore. The law further provides for "no discharge" by boats operated in enclosed lakes and reservoirs or in rivers not capable of interstate navigation. States may apply to the EPA to have certain other waters declared "no discharge zones" if discharge of treated sewage would be harmful. In short, boats with installed toilets must have an operable Coast Guard approved MSD designed to either hold sewage for pumpout ashore or for discharge in the ocean beyond the three mile limit, or to treat the sewage to Federal standards prior to discharge. So, yes John, macerators are for blue waters, or the coastal waters of nations that allow discharge.
 
Sep 25, 2007
4
Oday 34 portsmouth, U.K. O'Day 34 (currently in Florida)
A Chopper

Basically, a mincer, chopper, grinder, think of chewing, MACERATING ..... in the case to which you are obviously referring, it is a cutter-up of human waste prior to it's ejection by pumping into either a holding tank or the big blue sea..... NEVER coastal or inland waters!
 
Oct 2, 2007
131
- - Millville, NJ
Macerator

A macerator pump may not be used legally anywhere in the United States. You must be 3 miles or more out in the ocean (not the Chesapeake) in order to use one. Webster's New Collegiate Dictionary: Macerate - 1) to cause to waste away by or as if by excessive fasting. 2) to cause to become soft or separated into constituent elements by or as if by steeping in fluid. Broadly: to soften and wear away esp. as a result of being wetted or steeped. In English, it means to soften or reduce in size by some mechanical means. In a marine sanitation application, it means to shred or chop up the effluent so that it can easily be pumped. There are two definitions associated with maceration in the marine sanitation field: 1) A macerating toilet. The macerator is built into the toilet's discharge pump and chops and grinds up the effluent, making it easier to pump out of the holding tank later on. 2) A macerator pump. Commonly just called a "macerator." This is a pump with a built-in macerator, that is used to pump out a holding tank when 3 miles or more out to sea. It chops it all up so that there's less chance for unsightly "floaters" around the boat. As Peggie mentioned, ithe actual macerator is basically a form of cutter or blender blade.
 
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