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Old 11-04-2006, 06:15 PM   #1
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marine lav: black tank away from toilet?

I have a question before we start building based on our current layout plans.

Trailer is gutted completely and we're starting anew.

We want to put a black tank somewhere other than where we plan to put the toilet. We intend to use a marine-style toilet that has a pump that will pump waste to where the black tank will go. As our plans are now, we can't put the black tank under the toilet, we have a double axle that prevents that.

I don't even know where to look for such a marine toilet but my husband says he's done this for houses and that he knows boaters use them. Any boaters out there have any input?

Has anyone done this or have any product recommendations?

If it isn't possible, we'll adjust our plans. This layout, with the bathroom on the streetside of the trailer, will allow us to put a bedroom in the back that will fit both of us.
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Old 11-04-2006, 06:22 PM   #2
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Quote:
Originally Posted by pinkflamingoes
I have a question before we start building based on our current layout plans.

Trailer is gutted completely and we're starting anew.

We want to put a black tank somewhere other than where we plan to put the toilet. We intend to use a marine-style toilet that has a pump that will pump waste to where the black tank will go. As our plans are now, we can't put the black tank under the toilet, we have a double axle that prevents that.

I don't even know where to look for such a marine toilet but my husband says he's done this for houses and that he knows boaters use them. Any boaters out there have any input?

Has anyone done this or have any product recommendations?

If it isn't possible, we'll adjust our plans. This layout, with the bathroom on the streetside of the trailer, will allow us to put a bedroom in the back that will fit both of us.
West Marine, Defender, Boat US, JSI, Boaters World, that should give you a good start. You can get hand pumped marine toilet, electric marine toilet, anything you want.

Jim
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Old 11-04-2006, 06:30 PM   #3
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I'm already looking at a site called "Lavac", seems like it's do-able...I'll check out the other sites too. Do you have any experience with this kind of installation? We don't, and I'm nervous about it. Once we go with this, it's a done deal because the entire layout depends on what we do with the bathroom. I hate to get into something that's nothing but problems...but if we do a good job installing it, and take into consideration all things.. considered, it should work OK. All input welcome, help me anticipate problems....the cost of a marine toilet is high but we'll pay it to be able to sleep in the same bed and not have to step over the sleeping person to get to the lav.

Thanks, keep 'em coming...
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Old 11-04-2006, 06:31 PM   #4
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This is a good resource and technical info. Buy Jabsco products just about anywhere. Look under toilet systems.

http://www.jabsco.com/prodInfoApp/se...talogId=Marine
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Old 11-04-2006, 06:48 PM   #5
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Not Hard

Quote:
Originally Posted by pinkflamingoes
I'm already looking at a site called "Lavac", seems like it's do-able...I'll check out the other sites too. Do you have any experience with this kind of installation? We don't, and I'm nervous about it. Once we go with this, it's a done deal because the entire layout depends on what we do with the bathroom. I hate to get into something that's nothing but problems...but if we do a good job installing it, and take into consideration all things.. considered, it should work OK. All input welcome, help me anticipate problems....the cost of a marine toilet is high but we'll pay it to be able to sleep in the same bed and not have to step over the sleeping person to get to the lav.

Thanks, keep 'em coming...
I have changed them out on my sailboats. On my boats they take suction on the sea and pump overboard or to a holding tank to be pumped out later. This is done with a Y valve. Do a little research on marine systems. Contact user Boatdoc as he was in marine repair for years. I think it would be simple and very easy. I am sure that marine toilets can be setup to use water supplied by a pressure system instead of a seawater suction. Pipe to your blackwater tank with hose and you are good to go. I see no problems.

Jim
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Old 11-04-2006, 07:28 PM   #6
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I'm looking at toilets on the Jabsco site that say they need to be hooked up to a pressurized system requiring at least 3 1/2 GPM flow rate. Would it be possible to use the grey tank water as a source for this? Maybe a separate tank and pump needs to go in. I'll PM boatdoc...

here's the link to the toilet I'm looking at.

http://www.jabsco.com/prodInfoApp/se...I&typeId=JMTQF
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Old 11-04-2006, 07:38 PM   #7
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Quote:
Originally Posted by pinkflamingoes
I'm looking at toilets on the Jabsco site that say they need to be hooked up to a pressurized system requiring at least 3 1/2 GPM flow rate. Would it be possible to use the grey tank water as a source for this? Maybe a separate tank and pump needs to go in. I'll PM boatdoc...

here's the link to the toilet I'm looking at.

http://www.jabsco.com/prodInfoApp/se...I&typeId=JMTQF
I think it would be better to use greywater. If you hook up to your freshwater you need lots of double check, reduced pressure, antisiphon backflow prevention.
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Old 11-04-2006, 07:41 PM   #8
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Yes, definitely grey water. Putting a toilet anywhere near a freshwater system is just asking for Trouble with a capital T. I'm looking at The Vap site and there's a 4.0 pump and also the Shurflo site has a 3.7 all purpose pump that I suppose we could use. We'd have to have the grey tank full to flush, but isn't that how it's done anyway?
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Old 11-04-2006, 08:07 PM   #9
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AS Toilets Are Connected to the FW System

Quote:
Originally Posted by pinkflamingoes
Yes, definitely grey water. Putting a toilet anywhere near a freshwater system is just asking for Trouble with a capital T. I'm looking at The Vap site and there's a 4.0 pump and also the Shurflo site has a 3.7 all purpose pump that I suppose we could use. We'd have to have the grey tank full to flush, but isn't that how it's done anyway?
I think all current RV's have their toilets connected to the freshwater system as dose your home. Boats often use sea water for flushing and fire protection. It is hard to make fresh water at sea. Grey water will have to much trash in it to use for flushing. Toilets are designed not to have a cross connect as are your sinks, read air gap.

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Old 11-05-2006, 12:54 AM   #10
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Gotcha. I just was informed of that from my husband also. I thought he had told me it was the grey tank that provided the water for flushing.

This looks like it's going to work out OK, but I have no idea where to start looking for actual products and still have so many question marks going around in my mind. I called The Vap and bravely asked this question on their voicemail, and I'm hoping to learn from them too, what our options are. We've got a long way before we start installing the toilet. Sure could use a source for prefab shower stall too. When we do this finally, I'll take pictures and put it on my progress thread.
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Old 11-05-2006, 07:09 AM   #11
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Quote:
Originally Posted by pinkflamingoes
Gotcha. I just was informed of that from my
husband also. I thought he had told me it was the grey tank that
provided the water for flushing.
This looks like it's going to work out OK, but I have no idea where to
start looking for actual products and still have so many question marks
going around in my mind. I called The Vap and bravely asked this
question on their voicemail, and I'm hoping to learn from them too,
what our options are. We've got a long way before we start installing
the toilet. Sure could use a source for prefab shower stall too. When
we do this finally, I'll take pictures and put it on my progress
thread.
You will have a hard time finding a Pre Fab shower stall for
a RV or a boat. The reason is that a boat and a AS share sides which
are not straight but curved. The Airstream is relative easy as Aluminum
channel is used to hold partitions to the side of the coach which is
much easier than tabbing in with fiberglass. You man be able to use a
removed partition for a pattern of the curve or learn how to use a
tic-stick to get the curve of the trailer. On my boat I covered the
interior of the wet bath with plastic sheeting to seal out the water.
You often see this material in the restrooms of fast food restaurants;
I used contact cement to attach. As for a shower pan you may have to
fabricate one, but I do think you could adapt a home unit or a RV unit
to your needs. I have viewed so many wonderful custom interiors of
Airstreams I think you will have great success. Look up Boat US or West
Marine and make a visit to their stores, one of the catalogs has all
the diagrams of the various systems, a boat and RV systems are
basically the same. Good Luck Jim

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Old 11-05-2006, 02:01 PM   #12
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If you have the option to put the toilet on a raised platform so as to enable the 3.5" system (you would need at least 5" to allow elbows) to travel along the floor to enter the blacktank via it's top suface the you can use the conventional Sealand or similar toilet.
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Old 11-05-2006, 03:35 PM   #13
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One website that you might start with for finding marine plumbing things is as follows:

http://www.defender.com/

Another RV parts store that carries prefab shower pans for RV's is as follows:

https://www.rvpartsoutlet.com/newstore/nojava/index.cfm


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Old 11-05-2006, 03:39 PM   #14
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Quote:
Originally Posted by Jim Clark
I have changed them out on my sailboats. On my boats they take suction on the sea and pump overboard or to a holding tank to be pumped out later. This is done with a Y valve. Do a little research on marine systems. Contact user Boatdoc as he was in marine repair for years. I think it would be simple and very easy. I am sure that marine toilets can be setup to use water supplied by a pressure system instead of a seawater suction. Pipe to your blackwater tank with hose and you are good to go. I see no problems.

Jim
I have been thinking of installing a mascerator pump on the output side of my holding tanks. I have the impression that some forms of marine toilet arrangements have a single mascerator pump that can be used for pumping from the toilet to the holding tank and for pumping from the holding tank to the outlet for dumping. Does anyone have any specific knowledge or experience they would like to share about that type of installation - if it is possible?

Thanks,

Malcolm
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