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Old 02-10-2015, 06:19 AM   #1
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Dumb question....

Should the Grey water be bigger than the fresh water tank due to also collecting urine? I plan on rerouting the urine from a composting toilet to the grey and was just thinking would I not have to have a larger grey for not only the grey water but also the urine. Thanks
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Old 02-10-2015, 06:21 AM   #2
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Oh and I was looking at either two 32 gal tanks or a 27 gal fresh with a 32 gal grey, thanks again!
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Old 02-10-2015, 06:33 AM   #3
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By definition, if you put urine into your "grey water tank" it will no longer be a grey water tank but a "black water tank." That doesn't address your original question but since there are often greater restrictions on dumping black water vs. grey water you will need to keep this in mind.
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Old 02-10-2015, 06:39 AM   #4
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First, only questions that are not asked are dumb. Second, only shower and sink water are gray water. Any toilet water is black water and needs (should) go to a sewage treatment plant, and that includes urine.
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Old 02-10-2015, 06:57 AM   #5
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We always fill the gray before the black tank, so I would prefer a larger gray tank. However, I know others that fill the black first, in part because their bathroom sink drains into it, and because they have four people in the camper (we just have two people). It all depends on how you'll use it.
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Old 02-10-2015, 07:31 AM   #6
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Alright thank you everyone and for the explanation between the grey and black definition, but I think since we are going to be using a composting toilet we are just going to have one tank for all waste (shower, sink, urine) and will just dump as black water. So I am just having a tough time deciding how much waste tank we will need and how much freshwater we will need. We do not plan on doing multiweek Boondocking trips but would like to have the option for 5-7 days off the grid. There are two of us and are use to using the outdoors as a possible substitute when surroundings permit as another restroom. We will also be adding an outdoor shower to the trailer so that is the reason I believe we could get away with both tanks having a capacity of 32 gals with careful monitoring. Thanks for all the advice, very novice when it comes to airstream and travel trailers in general.
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Old 02-10-2015, 07:38 AM   #7
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32 gallons sounds good. You will learn how to conserve water if necessary. Don't forget even if you have a composting toilet, the gray water should still be dumped into a dump station. Running gray water into a container small enough to be carried can be dumped into a pit toilet, etc. jim
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Old 02-10-2015, 07:42 AM   #8
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Maybe there should be a third tank for YELLOW water ....
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Old 02-10-2015, 11:33 AM   #9
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Try to match the fresh water and holding tank as much as possible. Whatever you may divert from the holding tanks due to the use of the outside shower might be made up by the addiiton of the urine. Especially if you are both beer drinkers

In any event, get the biggest set of tanks you can carry. No boon docker ever said he wished his tanks were smaller. No one ever!
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