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post #1 of 12 Old 10-20-2010 Thread Starter
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holding tank capacity

I am having to replace the original built in fiberglass holding tank (25 yrs old) with a new tank..any experience out there about what should be the acceptable capacity for a new holding tank on a 37'?
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post #2 of 12 Old 10-20-2010
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Hi,
I use a 48L, because it fits into the locker. You can get bladders (I personally dont use) but they can be taylor made or fit intothe bilge.

So, whatever the bigest size that can fit into the space.

Good luck, it is a Pain!


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post #3 of 12 Old 10-20-2010
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I'd second getting the largest tank that will fit. The size of the boat matters less than how many people will be using the head and for how long.

According to Peggie Hall, the average person uses the head FIVE times a day. If you figure the head uses 1.5 pints per flush, you're looking at 15 pints per day for a couple...or basically TWO gallons per day per couple. So a fifteen gallon tank would last about a week.




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post #4 of 12 Old 10-20-2010
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Quote:
Originally Posted by sailingdog View Post
I'd second getting the largest tank that will fit. The size of the boat matters less than how many people will be using the head and for how long.

According to Peggie Hall, the average person uses the head FIVE times a day. If you figure the head uses 1.5 pints per flush, you're looking at 15 pints per day for a couple...or basically TWO gallons per day per couple. So a fifteen gallon tank would last about a week.
That is about right. We have a 15 gal and it lasts the wife and I just over a week.

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post #5 of 12 Old 10-20-2010 Thread Starter
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thanks Don...but I'm curious if you have a manual head, how many pumps do you typically use to flush? The reason for my question is that my system design requires the waste to be flushed above the level of the head thru hose that fishes into the sink cabinent then up to the top of the tank...then tank is emptied then by gravity to thru hull if your offshore. So I'm using 20 pumps to make sure the waste completely empties up and into the tank...but I'm afraid that results in filling the tank too quickly
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post #6 of 12 Old 10-20-2010 Thread Starter
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anyway, it sounds like a 16 gal new tank, the largest non-custom tank that will fit in the space, will be adequate
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Stiffwind—

You might want to actually test to see how many pumps it takes to clear the waste from the line... 20 pumps may be overkill. If you can use just the minimum number that clears the waste from the line, then you'll maximize the amount of time between pumpouts.




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post #8 of 12 Old 10-20-2010 Thread Starter
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and that test would be performed how?
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We did have a manual, but now we have an electric.

It usually took about 10 to 12 pumps to clear the hoses, but we would flush for water for a few pumps and then use the dry setting for the remainder.

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post #10 of 12 Old 10-20-2010 Thread Starter
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Are you happy with the electric head v. manual...or it it just another potential maintenance issue? Was the conversion difficult or expensive?
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