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Old 10-15-2009, 04:05 PM   #1
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RV Toilets, black and grey wars

To all RV toilet experts...and sailboat toilet experts.

I am laying out my floor plan...again. Knowing nothing about rv toilets I am under the impression that they have to go directly on top, ie. attached to the black water tank.

I would like to mount the thing elevated just on the back side of the wheel well, say half way up and use a 45* to 45* to the black water tank which would be mounted just behind the tires. Other than a little more water being used to get the "shite" where it needed to be, would there be a problem with this scenario?

Or, how about a pump toilet? How much water do these things use. It would seem alot but I don't have a clue.

Which brings me to the "why seperate the grey and black water" discussion. Is there a reason for this ie. spread the weight out or what?

S
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Old 10-15-2009, 06:46 PM   #2
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Re: RV Toilets, black and grey wars

Theres a ton of debate on combined vs seperate tanks. I think it is correct (although old school) that seperate tanks allow you to prolong dumping since you used to be able to dump gray anywhere. Most places dont allow this anymore. Alot of people say combined tanks are better since you have more water which helps flush out the solids better. An RV toilet uses such little water that (I guess) it can become an issue with solids building up. I personally went with a combined tank. If you plan on using a 2 45s to get to the tank you should really measure to see how much room you have. We went this route with the smaller sink drains and had a tough time with clearance which would only be worse with a 3" fitting. I would bet 2 45s in 3" pipe would drop you down close to a foot not to mention the rear axle and other items really being a pain to manuever around. If you had to remote mount the toilet and did not have a direct drop a marine macerating toilet might work better since you can use a flexible pipe and run it where you need to.
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Old 10-15-2009, 10:13 PM   #3
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Re: RV Toilets, black and grey wars

As for the issue of one tank or two, I can only state from experience that you will have to dump gray water more often than the black water, and generally speaking running gray water down AFTER you are done dumping the black helps to clean out the dump hose...

For the piping, the toilet doesn't have to go directly over the tank, it's just easier to plum them that way, and it makes checking to see if the tank is full much easier, open the toilet valve and shine a flashlight down there and see what the level is. I've got a friend with a Keystone Montana 5th wheel, his toilet is piped at angles to the tanks.

My own bus is the same way, the tanks are forward of the toilet, I just ran the pipes with a decent incline (actually decline) to the tank.

First image is a bit blurry... but it shows the run from the toilet flange down and forward...



And the next one shows the pipe going down through the cargo deck floor to the tank... note the 1.5" pipe poking up, that is for the vent stack...



I used slip grommets in the tank, made fitting the pipe to the tank extremely simple.




There are many sources for tanks, but the best deal I found for them was on ebay from, Tri-State Rock Your World seller is where i go mine from, he's got 36 gal tanks for $50 and also sells the slip grommets... He's not the quickest shipper on ebay, but he comes through!!

For other RV specific things, there is another dealer and though they have almost the same name they are totally different sellers. Tri-State Surplus has a lot of great deals, she is a fast shipper too. I have bought from this seller over a dozen times!!
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Old 10-15-2009, 10:20 PM   #4
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Re: RV Toilets, black and grey wars

I had to off set mine with a 45 into another 45 then the tank and it works fine.
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Old 10-15-2009, 10:21 PM   #5
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Re: RV Toilets, black and grey wars

I went with a combined 55 gallon black/grey tank. I also installed a valve before the tank that allows me to drain just grey water (kitchen sink and shower) by itself before reaching the tank. This way I can run a simple garden hose to a good drain sight and use all of the water I wish to with just the toilet filling the tank.
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Old 10-16-2009, 09:41 AM   #6
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Re: RV Toilets, black and grey wars

All good info....

So it seems that we have seperate tanks, mainly, because there was a time when gray water was disposed of differently than black water, i.e. gray water on the ground, black water in the tank. There are times when I will be in a location where that MAY be acceptable and preffered. Most of the time that will not be the case. I will have to hold all of it and carry it out(right Millicent burner?)
Time for a pro and con column to help with the decision. One tank installation would be easier by far. I do not believe my application will allow for the gray water to flush thru the black water tank.

On the plus side I did come up with a good floor plan(for my application) that will allow direct plumbing into the black tank. I have learned of a rule on tour buses among band members. No shite on the bus, literally. I wonder if I can make that stick on my bus...uh, I mean flow, stick bad

On a side note. I really enjoy putting this thing together. There is so much information and creativity here it gets my wheels turning but I need two things currently not forthcoming. More money and more time. Don't we all.............
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Old 10-16-2009, 11:22 AM   #7
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Re: RV Toilets, black and grey wars

This may be a little lo-tech, but what about putting a plastic grocery baggie inside the toilet to capture the 'leavins' (aka as when one takes her doggie for a walk) and then dispose of the waste that way. Could save some tankspace when you're on the road/near rest stop garbage cans.
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Old 10-18-2009, 12:12 PM   #8
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Re: RV Toilets, black and grey wars

What is a good rule of thumb for water usage per day per person. I am figuring 5 gallons. Does this seem excessive?

Also, I have found a blackwater tank that is near perfect size for my loction on the cheap. Does it matter where I cut the inlet hole for the toilet ie. do I need to tay away from the outlet to possibly reduce clogging?
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Old 10-18-2009, 02:24 PM   #9
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Re: RV Toilets, black and grey wars

So, assuming 60 gallons of fresh water capacity, I assume 65-75 gallons of black and gray water capacity. Other than being ALOT of water do the ratios seem ok?
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Old 10-18-2009, 08:11 PM   #10
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Re: RV Toilets, black and grey wars

I used the same tank from tristate. Tough to beat the price, 36 gal for $100 delivered.
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