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Old 12-15-2004, 06:17 PM   #15
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1959 26' Overlander
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You can get kits to convert some marine toilets to "electric" from manual pump. They all have some pump features as they are typically below water line. The Potta is a empty it yourself tray thing I think.

Sinks will gravity drain. Kitchen to the streetside and bath to the curbside. Toilet pump to streetside and shower pump to curbside. Then I have the mixed black tank with toilet and kitchen waste; and wash water curbside tank.

The advantage is one under floor connection at the shower, makes the floor alot easier. Every other connection and all tanks will be where they can be easily inspected for leaks. The tanks will be on trays to catch any leaks. I am curious about how loud these toilets are when flushed and the water hits the tank. I don't want to be the Archie Bunker AS.

Went around in a big circle and ended up with the original plan. Must be the right balance of trade offs for me. I don't really like those up in the air toilets or needing to consider heating tanks. The one line will be easy to send a little heat to as the bath heating vent will be just above it.
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Old 12-16-2004, 12:18 AM   #16
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The unit that I was referring to is evidently made by Sealand. It is item #500258 on the following page (the one at the bottom of the page):

http://www.defender.com/category.jsp...1|806&id=81394

That model has a 9 gallon holding tank that has an 1-1/2" outlet that can be hooked to a macerator pump.

There does seem to be quite a variety of different combinations of features in the marine category. I wonder how effective the manual pump units are. I would suppose that they would be quieter than electric units. The Blakes Lavac toilets are somewhat interesting in that most of them seem to be designed to have either a manual or electric pump mounted remote from the toilet itself. There is a Zenith head pump on the same page as the Lavac toilets that has the interesting feature of being able to work for the toilet as well as for pumping out the holding tank using a divertor valve. The pump does seem pretty expensive at $675 though. See the following page:

http://www.defender.com/category.jsp...|806&id=315132

I wonder if marine toilet electric macerator pumps are designe to handle the extra riggors associated with using salt water to flush? It occurs to me to wonder how marine holding tanks get pumped completely dry if they are having to pump up? Do they have low pickup points in them? The general marine holding tanks that I saw on the site are either the flexible type or more or less rectangular units. Most RV tanks have sloping bottoms that are especially oriented toward gravity assisted dump. That does not seem to be a concern (or even a possibility) with the marine units. Do the flexible tanks shrink up when the are pumped out I wonder? Some of the holding tank prices are pretty good on this site too if you can live with one of the standard sizes. On the following page you can get a 40 gallon tank for $109.99 which seems like a pretty good price point to me.

http://www.defender.com/category.jsp...7367&id=315193

Malcolm
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Old 12-16-2004, 06:02 PM   #17
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Thanks Malcolm I didn't see that toilet and it will save a few bucks. I appreciate the extra effort. That is a Todd tank and one 55 gal and one 40 gal (35 on some sites) are planned. They ship from Rhode Island so freight should be next to nothing for me or I'll go and pick them up.


Welder is coming tomorrow. So is the storm door guy with the 6 months to make storm door.

Have to go work on my Christmas GIFt
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