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Go Back   SailNet Community > On Board > Gear & Maintenance > Holding tank
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Thread: Holding tank Reply to Thread
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Topic Review (Newest First)
12-06-2007 07:51 AM
sailingdog You don't need a macerator pump to pump out a holding tank. I have mine setup with a manual Whale diaphragm pump and it works just fine, and is much lower maintenance and lower power usage than a macerator would be.
12-06-2007 03:03 AM
Omatako If you're planning on re-piping be sure to use proper "crapper" pipe, expensive but worth it. Most others allow the smell to permeate through. I have 2 large collapsible black water tanks and niether of them exude any odours but one of the pipes fitted cheaply by a PO was really smelly.

I have no macerator pumps but intend plumbing some in because in most instances where there are pump -outs (on 3 continents) that I have tried to use they have not worked.
12-05-2007 12:22 PM
DLM I've thought about "starting over" including a macerator..... I'm not so sure the flexible tank would hold back the smell very well....also, realize that the hoses are part of that problem too. Macerator would greatly for pumping out where allowed....

Thanks guys....
12-04-2007 06:07 PM
dougyoung If you can fit it, Install a macerator to pump the tank. Best thing I ever did. I have a electric head that pumps directly inot the tank, then I can use the pump to empty the tank at sea or use the pump out station via a y valve. Include the loop and you will be happy
12-04-2007 05:54 PM
HoffaLives yeah, not least because working on a used sewage system is far worse than a new one. it might be best to step back, assume that you are starting from nothing, and design a proper system. you can get tanks custom made to fit strange places, or find a premade model of the correct dimensions. there are even all-in-one units that include all the fittings and a macerator, but you'll be pumping out a lot as they are pretty small.
the other option, and I wanted to do this but my head (as in toilet) was too small, and that is to use one of the new marine composting toilets. apparently they work quite well.
12-04-2007 02:49 PM
sailingdog I am guessing that your holding tank is below the water line. UGH. The guy who installed it without an anti-siphon valve should be shot.
12-04-2007 02:37 PM
DLM Not sure what I'm going to do with this situation. I think it was installed improperly to start with as the line that allows water to flow into the holding tank comes directly out of the bottom of the boat...there is a shutoff valve...tracing the other lines is next to impossible. They go behind a bulkhead that from what I'm able to determine...is inaccessible.

I don't like the flexible tank either...however, there is very little room for a rigid tank...?

Thanks for the input....
Butch
12-04-2007 02:28 PM
sailingdog Hoffa is just looking for company on **** creek.
12-04-2007 01:54 PM
HoffaLives it warms my heart to read another having problems with the poo pot. you're in mediocre but eager hands here at sailnet, and we'll try and help.
as for water rushing in were poo fears to tread, you are missing an antisiphon loop. basically a loop of hose coming from the tank outlet that has it's apogee above the waterline and has an antisiphon fitting on it. i would also reconsider the flexible tank unless it's very small; they do not have great longevity from i've heard, and a ruptured septic tank aboard is as bad as it gets.
12-04-2007 01:45 PM
sailingdog Also, depending on where you sail, the pumpout facilities may be free or may cost up to $30 or so per use. Down where I am, the local harbormaster has a pumpout boat that comes right to my slip and empties the tank for free.
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