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 Catalina/Capri 25/250 Sailor's Forums
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 Cat 25 Septic Tank
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jduck00
Captain

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USA
313 Posts

Initially Posted - 03/31/2013 :  16:17:49  Show Profile
I've looked through the forums, and Google, but haven't been able to find anyone that has moved the septic tank to the bow.

I have a 1980 swinger with the dinette setup. I need to replace the tank anyways so I was thinking of moving it forward and going bigger. I need to measure a 2nd time but it looks like http://www.plastic-mart.com/product/6162/20-gallon-marine-holding-tank-h2020-b-bow will fit.

Has anyone done this before?

Jeremy Duck
The Lucky Duck
1980 SKSR Hull # 1850

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trptelf
Navigator

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USA
113 Posts

Response Posted - 03/31/2013 :  20:58:07  Show Profile
Try searching "holding tank" instead of septic tank, and add v berth and other spellings of v berth. There are threads on this.

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Arlington
Navigator

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USA
196 Posts

Response Posted - 03/31/2013 :  21:48:53  Show Profile
Hi Jeremy, welcome to the Forum. My boat came with a 12 gal tank located under the v berth. I think it is this tank, http://www.tank-depot.com/productdetails.aspx?part=RW-B105. It rests on two glassed in 2 by 4's and is secured with two shipping straps.
Doug

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mrapkins
Navigator

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USA
124 Posts

Response Posted - 04/01/2013 :  06:40:58  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Arlington</i>
<br />Hi Jeremy, welcome to the Forum. My boat came with a 12 gal tank located under the v berth. I think it is this tank, http://www.tank-depot.com/productdetails.aspx?part=RW-B105. It rests on two glassed in 2 by 4's and is secured with two shipping straps.
Doug

<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

My setup is identical. Just remember that the tank you select has to fit through the opening on the top of the v-berth. There is plenty of room for a bigger tank, just no way (without enlarging the opening) to get it in there.

Also, think really hard about where you want the in/out/vent barbs located. I put my "input" at the top right of my square tank so as to facilitate access for installation. However, the hose from the head now travels from the head, all the way around the back of the tank around the right-hand side to a 90 degree elbow on the front!!!

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jduck00
Captain

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USA
313 Posts

Response Posted - 04/01/2013 :  07:18:29  Show Profile
Thanks fellows. This site has been a ton of help so far. I like the idea of the tank not sitting directly on the hull. I haven't thought about glassing in supports. Might have to give that a try.

The potential issue I've been thinking about is how to get any water out of the v berth once a tank is installed. I've thought about adding a small drain and letting it run out on the floor in front of the toilet. I have a few small leaks to patch up so it may not be an issue after that.

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awetmore
Master Marine Consultant

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USA
1144 Posts

Response Posted - 04/01/2013 :  09:45:52  Show Profile
I think that a larger tank should fit into the stock location under the forward dinette bench. On our 1984 boat there was a lot of unnecessary plumbing in there (Y-valve and direct overboard throughhull) considering that overboard dumping of waste is illegal in most places where a C-25 would be sailed.

I'd personally consider capping or removing that through hull.

Do figure out a good way to secure it. A 20 gallon tank will likely weigh 180-200lbs when full.

When I replaced the tank on my Pearson I went with all top-style fittings and a dip-tube for the pump-out hose. That eliminates waste from ever sitting in hoses, which really increases their lifetime and reduces odor. My tank is tilted with the dip-tube in the bottom corner, so that when it is pumped out there is almost nothing left.

This is also a good time to upgrade the vent hose. A large hose that is as short as possible (I'm using 1-1/2") will provide much better air circulation, which keeps the biological environment in the tank biased towards non-stinky bacteria.

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sailboat
Navigator

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USA
149 Posts

Response Posted - 04/01/2013 :  09:48:04  Show Profile
We have the holding tank under the fwd settee of our 1980 SK/SR dinette version...I think the book says 14 gallons. What my concern would be moving the tank forward is boat trim. Either our waterline is incorrect or the boat has a constant down by the bow trim. Our 9.9 two stroke is on the port side and I have as much gear stored aft as possible with nothing in the the bow. Even the anchor locker has only one small anchor and 6' of chain with a 75' rode and it is still down by the bow about 2". No head sail or roller furling is installed either.

Maybe the boats are down by the bow so that when sailing with crew in the cockpit it rides level.

At any rate figure 8lbs/gallon plus the tank plus plumbing for the bow installation. Maybe put the equivalent amount of weight at that location and see what it does, if anything, to the trim and handling.

Mike
1980 SK/SR dinette version

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Arlington
Navigator

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USA
196 Posts

Response Posted - 04/01/2013 :  19:19:21  Show Profile
Mike I sure like your idea for a test!
Doug

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