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Old 01-04-2013, 11:19   #1
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Join Date: Aug 2011
Location: Homeport is Anacortes WA. Now sailing the Sea of Cortez
Boat: Pacific Seacraft "Crealock" 34'
Posts: 31
Replacing Holding Tank

I have given up on trying to reseal the original holding tank on my Pacific Seacraft '34, and now plan to remove it and replace it with a molded one-piece tank that (hopefully) will be bullet-proof. Anyone have any experience with this, or suggestions about which tank to use? Thank you in advance. John on S/V Victoria.
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Old 01-04-2013, 11:58   #2
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Join Date: Nov 2008
Location: Living aboard & cruising since 1972
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,043
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Re: Replacing Holding Tank

I put two holding tanks in my 1973 ketch that was originally constructed without tanks. I selected the Todd tanks which I've been pleased with; however, I have no other holding tank experiences. If you are converting the space to adapt a fit, be sure to secure the tank well. I added nylon tie-down straps in addition to a wood framing support. I also selected the use of two vents to increase aeration. I've also been pleased with the plumbing choice of having a single path from the head to the holding tank with no Y-valve. My effluent from the tanks includes a T-fitting led to the pump out deck fitting and a macerater to a through hull (still no Y-valve). Compliance to regulation is achieved by removing the handle to the through hull seacock in the closed position as well as having the access locker locked.
Take care and joy, Aythya crew
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Old 01-04-2013, 16:50   #3
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Join Date: Feb 2004
Location: Pelican Bay, Great Sandy National Park
Boat: Steel Roberts Offshore 44
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Re: Replacing Holding Tank

I fitted a 150 (aprox.) litre welded polyethylene holding tank to Boracay about 4 years ago. No problems have been experienced with the tank or the plumbing.

However I should have made the top of the tank as low as possible. Pumping up 1.2m is too far for the Lavac pump to be comfortable and there is almost always some backflow.

The high tank does make pumpout very straightforward.

I replaced the Lavac pump last year.
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