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Open Roads Forum  >  Beginning RVing

 > How fast do the gray and black tanks fill

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Grit dog

Black Diamond, WA

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Posted: 08/30/21 11:54am Link  |  Quote  |  Print  |  Notify Moderator

Comfortably (as water usage varies wildly based on.....use), 2 people, one week, navy shower every day and conserving water while doing dishes, you're up for at least 1 dump and refill of fresh and gray water.
Black tank will make it if you forego the preferred method of using "plenty of water" to wash down every #2 deposited.
Note when black tanks get full or near full, they generally start stinking if you drive any real distance (ie sloshing around for extended periods of time).


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Mike134

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Posted: 08/30/21 01:36pm Link  |  Quote  |  Print  |  Notify Moderator

Wife and I can go a week on the black tank, 5 days is the best so far on gray. We wash dishes outside in 2 tubs one to wash one to rinse and throw the water into the shrubs. ( I know the horror) Navy showers, never letting the water run while shaving or brushing teeth.


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JimK-NY

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Posted: 08/30/21 01:58pm Link  |  Quote  |  Print  |  Notify Moderator

There is absolutely no way to tell how much water you will need. Habits are the big factor. At home I leave the faucet running while I wash my face and brush my teeth. Habits like that will run through the fresh water tank and overflow the gray water tank quickly.

When I camp and water is not available. I get by on about 3 gallons per day. Roughly 1 gallon for drinking, 1 gallon for dish washing and cooking, and the remaining gallon for a shower. I don't fall short but there is no wasted water in the processes.

way2roll

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Posted: 08/30/21 02:36pm Link  |  Quote  |  Print  |  Notify Moderator

We carry 5 gal jugs of water for cooking and drinking and that helps. As others have stated, use less water, take less and shorter showers. DW hates this, she loves a long shower. I Cringe the entire time she is in there when we don't have full hookups. I explain the issue - she doesn't care. Apparently it's my issue. :-)


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obgraham

TriCites WA

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Posted: 08/30/21 03:15pm Link  |  Quote  |  Print  |  Notify Moderator

Just because the site doesn't have full hookups doesn't mean there is no water or sewer facility.
We very often walked to a nearby spigot for dishwashing water, and we would use the toilets there if they were acceptable.

RKW

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Posted: 08/30/21 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

The tank capacities listed in the OP are close to the ones in my RV. As others have said, there is a lot of factors that figure in as to when the tanks will be full. We are experts at taking navy showers. We also almost never do dishes, preferring to use paper plates and such. We can usually get about 4-5 days before having to dump our gray and black tanks.


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  • rlw999

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    Posted: 08/30/21 05:19pm Link  |  Quote  |  Print  |  Notify Moderator

    Quote:

    I have a potable water jug to refill the fresh water


    I wouldn't drink the water from a rental RV's freshwater tank, as you don't know how often they sanitize it, or how safe the water is that the last guy refilled it with. I regularly sanitize my own tank and while I'll brush my teeth with that water, I still drink from a separate water jug(s) I fill from home.

    wa8yxm

    Davison Michigan (East of Flint)

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    Posted: 08/30/21 05:22pm Link  |  Quote  |  Print  |  Notify Moderator

    Depends on several things. Black tank? how big and how much do you flush every flush (Usually about a gallon) so it's capacity/flushes

    Gray gets shower, sink washing machine, lav's.

    Now some rigs have like 10 gallon tanks (Trailers) some 30-40-50 Many motor homes At least one it's well over 100 gallons or so I'm told.

    So this is all important.

    Mine were 36 gallons and with my wife 1/2 week me alone 2-4 weeks.


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    MarkTwain

    Northern, Ca. , USA

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    Posted: 08/30/21 05:43pm Link  |  Quote  |  Print  |  Notify Moderator

    "Depends on how often you shower and use the potty"

    rdhetrick

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    Posted: 08/30/21 06:15pm Link  |  Quote  |  Print  |  Notify Moderator

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    Rob
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