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Old 04-25-2016, 01:30 PM   #1
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Black Water Tank problem ... need help!

I have a 1995 Thomas Gensis bus. I have not finished the construction but I have the shower and toilet in the middle of the bus. Now that I am ready to install black and grey water tanks I have a problem. The middle of the bus under neath has 2 storage compartments. So I have to either remove the storage compartments or put the tanks at the back of the bus and run long pipes to them. Can anyone help me out here? Any and all suggestions or solutions are very welcome.
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Old 04-25-2016, 01:35 PM   #2
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You can't put the tanks in the storage compartment?
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Old 04-25-2016, 01:38 PM   #3
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Even if you wanted to keep the storage compartments open and available for storage, I don't see the problem with running plumbing along the top of the compartment to reach your black water tanks in the rear of the bus. I sure wouldn't remove the storage compartments. They're the perfect place to put your tanks.
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Old 04-25-2016, 02:26 PM   #4
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An RV toilet flush doesn't usually have as much water accompanying it as a residential toilet flush would, so one wouldn't want the black tank far from the toilet. Most often the toilet drops straight down into the black tank. No worries about slope or inadequate water flow failing to carry solids all the way to the tank that way!

I don't see any problem with locating the gray tanks remotely so long as pipe routing works out.

If the tanks are low profile and don't fit conveniently inside the storage compartment, perhaps a hole could be cut through the compartment wall so that the tank is partially in and partially out..?
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Old 04-25-2016, 03:15 PM   #5
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I can't recall ever seeing a professionally built, flushing RV toilet that did NOT drop directly into the black tank. As noted above, they use very little water. Getting the nasty stuff to travel more than a foot horizontally isn't gonna' happen without a LOT of water pushing it along. Gray? Yes. Being all fluids, it only needs a little slope to find it's way to the tank.

Which brings up that issue. I have indeed seen home-builts with very long plumbing runs for the gray. But...keep in mind that if you only build in the "standard" 1/4" drop per foot as specified for fixed domiciles...you will likely have issues. Remember, your skoolie is not "fixed" to a slab and is subject to being parked on fairly uneven terrain. In short, you need a lot more slope in your plumbing drains to compensate for any lumpy parking spots you will almost certainly encounter. Another argument for carrying lots of leveling blocks too, I might add.

Unless you install a pump...water rarely flows uphill.
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Old 04-25-2016, 03:34 PM   #6
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They do make those masserator pumps for RVs. There's always a way to accomplish your goals, but like most of us you'll probably opt for the inconvenience of something that works simply and is effectively inexpensive.
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Old 04-25-2016, 07:20 PM   #7
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A long piping run with enough grade to not be a constant problem will probably make your tank sit to low to be safe enough to keep from being a low rider in the back.
You are going to use a lot more grey water than you are Blackwater.
I have not dealt with to many Macerator pumps but they are mainly built to chop up solids kind of like a garbage disposal not pump mess up hill. The ones I have dealt with were 4",8" and 24" and they could chop something to pieces but after (depending on size) 1' to 3' they didn't move the water/macerated solids much after that.
If your set plan is to have your tanks there then find tanks that will fit in the storage compartments or cut them out and re-use the framing to support the tanks.
I salvaged tanks from an old coachmen that were 35 black and the exact same for grey tank and a 70-gal. For the fresh which equals both drain tanks .
My wife and I played with many ideas but for my bus the bath-in the back work best ?
At one time I had found a company that could make any size plastic tank you wanted.
They sent you there sketch sheet and you designed your tank size, in's out's and all and they weren't that bad on pricing.
That was a while ago so the only ones that come to my mind is a company called plastic oddities and I think any AGRI SUPPLY store can probably show you a tank catalog and then you have a company name to talk to without the big box store.
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Old 04-25-2016, 08:07 PM   #8
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im putting mine in the compartments
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Old 04-25-2016, 08:38 PM   #9
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there is a nice macerator toilet from thedford. even has a bidet option!

http://www.thetford.com/product/tecma-silence-standard/
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Old 04-25-2016, 08:52 PM   #10
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Quote:
Originally Posted by slager55 View Post
I have a 1995 Thomas Gensis bus. I have not finished the construction but I have the shower and toilet in the middle of the bus. Now that I am ready to install black and grey water tanks I have a problem. The middle of the bus under neath has 2 storage compartments. So I have to either remove the storage compartments or put the tanks at the back of the bus and run long pipes to them. Can anyone help me out here? Any and all suggestions or solutions are very welcome.
You have a Thomas or a Genesis, but not both. AmTran and Genesis are the same company.

Next question. You installed the shower and toilet in the middle of the bus without planning where your tanks are going to be mounted? Where are you going to move storage to? This whole thing is confusing and is making my little brain hurt. I have read your post several times and I'm still confused.
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