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Old 07-01-2009, 07:00 PM   #1
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Grey water tank enlightenment

I was getting ready to use this new water water treatment chemical (Sea-Zyme) and it says to clean your tanks prior to use.
We are heading out on a trip tomorrow. The sloshing of the water will clean your tanks and the drain them when you get to your destination. Then add the new odor eliminator.
The procedure is to fill your water tanks 1/3 and add 1/3 Dawn Original scent dishwasher detergent to each tank. I poured 1/3 cup Dawn in kitchen sink and filled the tank till it read 1/3 full on the galley side. Went and did the same thing in the bathroom thinking it would fill the bathroom tank. WRONGIt kept filling the galley tank. Pretty soon there was water backing up into the galley sink.
The bathroom grey tank only holds shower water.
Something else learned.
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Old 07-02-2009, 12:07 AM   #2
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on my moho, there is one 54 gallon gray tank that gets water from the galley sink, bathroom sink and the shower. this tank is drained by one gray tank dump valve.
then there is the black tank for the toilet that holds 40 gallons which is drained by the black tank dump valve. 2 dump valves=2 tanks.
if you have 2 separate gray tanks, you will have 3 dump valves.
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Old 07-02-2009, 06:37 AM   #3
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We have two grey tanks and valves. I was not aware that the bathroom sink emptied into the galley tank. I just assumed, (and you know what that means) that the bathroom sink emptied into the shower grey tank)
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Old 07-02-2009, 12:21 PM   #4
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My bathroom sink empties into the Black tank. I was wondering why this was until I read somewhere that the number one mistake rv'ers make is not using enough water in their black tanks. It also comes in handy when dry camping to dump dish pan water into that sink. Not if there was just a easy way to equalize gray to black.
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Old 07-02-2009, 02:13 PM   #5
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Holy crap! Ok, bad pun. It never occurred to me that my bathroom sink was draining into the black tank. I checked, and that is in fact what is happening. So, when I thought I was treating both by putting chemicals in the toilet and the bathroom sink, I was actually double treating the black, and not treating the grey ar all.

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Old 07-02-2009, 04:02 PM   #6
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Maverick, there is an easy way to equalize your grey and black water tanks. Get one of those auxillary dump valves with the bayonet mount that most rv parts stores sell. Put it on where your dump hose connects, keep the new valve closed, open both the gray water valve and the black water valve. Whichever is fuller will flow over to the other untill they are equal amounts. We've done this for a few years now, works great, and I don't have to disconnect and go to the dump station so often while on extended stays.
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Old 07-07-2009, 09:19 AM   #7
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Ok, I looked at the drawings for my coach but can't tell much from it as to if my lav drains to the grey tank. Anybody know about my model???
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