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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 250 Specific Forum
 Holding Tank Location		  New Topic  Topic Locked
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lezaks
Deckhand

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USA
6 Posts
Initially Posted - 06/08/2011 :  16:33:07  Show Profile
Hi all,

This summer I'm looking to do a plumbing overhaul on my C 250 swing keel. When I got her she had one of those "Sanipotty" systems with a built in holding tank, but I'd like something a little more formal for week-long trips up to the San Juan Islands.

I'm having trouble figuring out where to put a holding tank, however. I'm tempted to convert the current water tank located under the V-berth to a waste tank and install a new water tank under the starboard bench, but I'm concerned about the length of hose I'll have to run from the head to the V-berth. Any suggestions or stories from more experienced C 250 owners?

Many Thanks,
Stephen
Sea Minor
C250 Water-Ballast Sail #4
Portland, OR
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 06/08/2011 :  18:59:07  Show Profile
The waste tank typically goes in the aft area by the battery.

We installed an MSD which is basically a porta-potti but that can be plumbed for pumpout. Works great and is less expensive than a full marine system. We use it in the San Juans. I think this is a good solution for our size boats.

Our [url="http://www.catalina-capri-25s.org/forum/topic.asp?TOPIC_ID=14873"]MSD project[/url].
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TakeFive
Master Marine Consultant

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2272 Posts
Response Posted - 06/08/2011 :  19:39:30  Show Profile
Randy - Can you re-post the full size pics?

Stephen - My marine head is where Randy describes - in the aft area behind the battery. I am not at all fond of having it there. I calculated the dead volume of the hose (I'm a chemical engineer, so I get my jollies doing those sorts of things ), and it is over a gallon. The holding tank is only 6 gallons, so you have to pump <u>a lot</u> of water each time and fill up the holding tank very fast, or leave undesirable stuff in the hose between flushes. Not a good situation. I'm considering replacing it with a Porta Potti, which I just happen to have in the basement from one of my other boats. I'll also look at the MSD that Randy describes, especially if there's a way to pump it (in one large batch) into my current holding tank so a pumping station can easily pull it out of the boat.

In theory a larger tank would help the situation, since 6 gallons is very small. But as usual, there's a long story behind it. The previous-previous owner said it originally had a 12 gallon tank, but it was rubbing against the steering mechanism so he downsized to 6 gallons. As far as I can tell, the boat originally came with tiller steering and a 12 gallon tank, and later was fitted with Edson C250 pedestal, which created the rubbing problem.

So if you have tiller steering, you can probably fit a 12 gallon tank. If you have a wheel, you may have to go with a smaller tank. Installing in the V-berth area would make for an even larger dead volume in the hose.

One possibility might be to try to fit something into the bottom of the wet locker, or the storage area directly behind it. That would significantly reduce the dead volume and enable flushing with much less water. But I don't know anything about the shapes of holding tanks that are available.
Edited by - TakeFive on 06/08/2011 19:41:08
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TakeFive
Master Marine Consultant

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2272 Posts
Response Posted - 06/09/2011 :  05:22:42  Show Profile
One other thing I forgot to mention. The common practice of placing the holding tank in the battery area puts the holding tank above the toilet. This makes all the problems worse, because the &gt;1 gallon of water filling the hose does not drain into the holding tank - it sits in the hose or, if the toilet's seals are not pristine, drains back into the toilet bowl.
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 06/09/2011 :  06:32:26  Show Profile
I'll upsize the photos in the next day or two. Shutterfly does the downsizing after a while.

Here is a link to Arlyn Stewart's web site and his tank location behind the wet locker.

[url="http://pages.suddenlink.net/arlyn/sailing/holdingtank.html"]Arlyn's Solution[/url].
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.