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Old 22-07-2013, 22:39   #1
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How Long Does it Take to Fill your Holding Tank?

On looking at specs for the new Jeanneau 509 in Cruising Helmsman magazine I'm horrified to see that it has only an 80 litre holding tank. Is this typical and how long would this usually last with say 6 people on board? I find it hard to believe that all these production boats anchored in the Whitsundays here are all "doing the right thing" if that is their holding tank capacity.
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Old 22-07-2013, 23:04   #2
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I assume it must be plumbed like ours - sinks and showers plumbed to drain overboard ("gray water") but only the toilets go to the holding tank. 80 liters - roughly 20 gallons, depending on the amount of water used per flush - we have a jabsco forward and raritan aft, average flush maybe half a gallon, roughly. We have 20 gallon tanks too, although two of them, one for each head. That's 40 flushes per tank, not too bad, although of course you don't and probably can't "top off" a holding tank. Hmm. I guess that is kind of small if you've only got one.
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Old 23-07-2013, 02:07   #3
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Re: How long does it take to fill your Holding Tank?

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I assume it must be plumbed like ours - sinks and showers plumbed to drain overboard ("gray water") but only the toilets go to the holding tank. 80 liters - roughly 20 gallons, depending on the amount of water used per flush - we have a jabsco forward and raritan aft, average flush maybe half a gallon, roughly. We have 20 gallon tanks too, although two of them, one for each head. That's 40 flushes per tank, not too bad, although of course you don't and probably can't "top off" a holding tank. Hmm. I guess that is kind of small if you've only got one.
OK, that tells me what an average flush would be (approx 2 litres) which means 40 visits. If we average say 5 visits per 24 hours per person, that means that 1 person would fill the tank in less than 8 days or and with 6 aboard (what the Jeanneau 509 seems to be designed for) in 1.3 days. Since the charter boats here in the Whitsundays are chock-a-block with beds and therefore people and they are standard spec production boats, how can they be complying with the strict regulations regarding pumping out holding tanks if this is typical for capacity?
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Old 23-07-2013, 02:38   #4
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Re: How long does it take to fill your Holding Tank?

About 150 litres lasts us 10 days of moderate use by two, or about 7.5 litres per person per day.

With extreme care (i.e. using marina toilets whenever possible) that can be extended to 20 days.
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Old 23-07-2013, 08:32   #5
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Re: How long does it take to fill your Holding Tank?

Depends. Are any of your crew politicians?
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Old 23-07-2013, 09:28   #6
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Re: How long does it take to fill your Holding Tank?

Our 2008 Hunter 44DS has a 45 gallon black water tank (170 liters). We fill it in about a week.
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Old 23-07-2013, 09:43   #7
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Re: How long does it take to fill your Holding Tank?

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Depends. Are any of your crew politicians?
I needed a good laugh today. Thanks!!
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Old 23-07-2013, 09:57   #8
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Re: How long does it take to fill your Holding Tank?

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Depends. Are any of your crew politicians?
haha..
a local small community just accidentally dumped 40,000 gallons of raw sewage the other day. happens all the time... sometimes it's in the millions of gallons if it's Seattle.
Meanwhile, here we are trying to figure out how to crap on a boat a couple times a year....
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Old 26-07-2013, 18:24   #9
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haha..
a local small community just accidentally dumped 40,000 gallons of raw sewage the other day. happens all the time... sometimes it's in the millions of gallons if it's Seattle.
Meanwhile, here we are trying to figure out how to crap on a boat a couple times a year....
Yup. We have a purasan and a recent guest thought it disgusting. Meanwhile her city water company averages one spill a month over 100,000 gallons.
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Old 26-07-2013, 18:49   #10
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Re: How long does it take to fill your Holding Tank?

I GUESS IT DEPENDS ON HOW MUCH THE PEOPLE ON THE BOAT EAT AND DRINK ***
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Old 26-07-2013, 20:12   #11
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pirate Re: How long does it take to fill your Holding Tank?

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About 150 litres lasts us 10 days of moderate use by two, or about 7.5 litres per person per day.

With extreme care (i.e. using marina toilets whenever possible) that can be extended to 20 days.

I'll bite: What is "moderate use" Cap?
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Old 26-07-2013, 20:21   #12
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Re: How long does it take to fill your Holding Tank?

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On looking at specs for the new Jeanneau 509 in Cruising Helmsman magazine I'm horrified to see that it has only an 80 litre holding tank. .
Per head.

You have a holding tank in each head. So if its a 50 footer you'd have at least 3 heads so its 240 litres.
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Old 26-07-2013, 20:33   #13
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Per head.

You have a holding tank in each head. So if its a 50 footer you'd have at least 3 heads so its 240 litres.


In real numbers that's 60 gal of poo. For newbies, 60 gal of poos is more than a 55 gallon drum! of poo!


Added to the oceans' poo-pourri. I think we should keep talking up desiccating heads.
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Old 26-07-2013, 20:47   #14
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Whale poop is.....impressive.
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Old 26-07-2013, 21:03   #15
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Re: How long does it take to fill your Holding Tank?

If yall have ever been down tide and wind of a Sea Lion Rookery, you mite just have an Idea of the amount of poo put in the sea everyday from just seals and sea lions LOL It would really suprise ya !! your little 60 gals of poo is nothing !! LOL
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