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Old 01-23-2016, 02:03 PM   #15
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Way too much variability to be meaningful for anyone except each owner of their specific RV and lifestyle.

The spec's on my Fresh tank is 80 gallons. My Grey is 60 gallons and my Black is 40 gallons. However you cannot use ALL 80 gallons of fresh water (there is always some left in the bottom when the water pump starts pulling air) and the black and grey hold more than what they were spec'd at when completely full to the very top. I never go by what my tank monitors indicate.

Bottom-line, with proper conservation, my wife and I can go 7-9 days on the fresh water before needing more. That will not fill up the grey or the black. If I fill up the fresh one more time, usually within a couple of more days the grey will need to be dumped and the black can go 12-14 days before dumping.

We take Navy showers, use a tub for dish washing, never leave the water running on any faucet, and we adjust the water level used for the toilet to its lowest setting which is about one cup of water into the holding bowl and about one quart to flush.

Oh, BTW, we always start out with a FULL fresh water tank. It doesn't mean beans for any decrease in fuel mileage versus having water in case we have a breakdown or travel delays, etc. For the perfectionist it may mean .01 MPG less, who cares.

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Old 01-23-2016, 02:18 PM   #16
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Our fresh/grey/black tanks are 95/43/43 gallons (2015 Palazzo 35.1). We dry camped a week at the Florida RV Super Show and left with 2/3 fresh, 1/3 grey and 1/3 black. Collecting the shower water in a bucket until it gets hot helped conserve.
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Old 01-23-2016, 03:10 PM   #17
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How Long Can You Go Before Emptying Holding Tanks???

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Originally Posted by cimplexsound View Post
Obviously one of the mastery skills of a dry camper. So that is the big question. How long can you hold off between dump station visits???😕 I have found even in an RV park, if I am conservative with my water, I can make the gray water last a week before emptying and sometimes I only have to empty the black water once a month. Of course I always empty all tanks including fresh water and travel dry weight before I hit the road for my yearly snowbird migrations to save on gas.
Some of you however are seasoned boondockers, so you have mastered the skill down to a science better than any of us. So again how long can you make your holding tanks last before it becomes an absolute crisis if you don't visit the dump station or call the honey wagon service. So please bring your feedback here. I of all people want to learn the art of dry camping. Thank You

Every RV model has different tank sizes, and every RVer has different water use habits.
When you get out boondocking, one tank will "burp" before the other, and you will need to dump both. That's how long you can go.
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Old 01-23-2016, 03:36 PM   #18
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Excellent response, since beer is a rental substance .

Our TREK has 80 gallon fresh water and 40 gallon each grey and black tanks. We do of dry camping at autocross events, and our maximum time is 5 days with short showers and other water conservation techniques.

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Depends on the weather. Hot weather, beer consumption goes up, and so does black water tank level !
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Old 01-23-2016, 03:41 PM   #19
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It also depends on the toilet(s) installed. Previous RV had standard RV toilets, we could go 9/10 days. This one has two Thetford Tecma electric toilets. They use so much water, our dump time has been cut in half, and sometimes only four days. New is not always better.
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Old 01-23-2016, 06:07 PM   #20
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You can add a shutoff valve to your dump hose connection point to allow your grey water to flow over to your black water tank and extend the number of days between dumps. One of the best additions I've made to our RV and it cost less than $20.
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Old 01-23-2016, 07:14 PM   #21
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A lot of variables. Hot versus cold weather. Outside shower or not. Lake to swim in or not. 20 gallon black tank or 40. 40 gallon grey or 60 or more. Do you use campground facilities or not.
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Old 01-23-2016, 08:44 PM   #22
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So many variables. . .

We usually dump the grey tank every second day, without special efforts at conserving water. We recently went 9 days at a state park with no sewer hookups by conserving, using CG showers and lots of paper plates, plastic forks, and restaurants for dinner.

I’ve gone as long as 4 weeks on black tank with me alone in the woods, and still not full. We most recently went 17 nights on black tank before dumping prior to driving to next destination.

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Old 01-23-2016, 10:28 PM   #23
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You can add a shutoff valve to your dump hose connection point to allow your grey water to flow over to your black water tank and extend the number of days between dumps. One of the best additions I've made to our RV and it cost less than $20.
Ditto! It also provides a good way to rinse the black water tank with grey water.

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Old 01-26-2016, 06:56 AM   #24
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4 weeks, the wife says never again !!!!! 3 weeks MAX
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Old 01-26-2016, 07:12 AM   #25
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Assuming we're starting with a full tank of fresh water (100 gallons) and empty holding tanks (40 gallon black tank/60 gallon gray tank) - we can go 3 days without any adjustments to our water use habits (a daily shower for each of us, washing dishes with a constant freshwater rinse running, maybe a load of laundry, etc.) We can go 4-5 days with minor adjustments to our habits - cutting out the "running rinse", skipping a shower or two, not doing any laundry, etc. We can stretch to 6-7 days without too much trouble by further reducing the # of showers / taking "navy" showers for those that we do take, dramatically reducing dishwashing (using paper plates, avoiding meals that require much cleanup, etc.), changing our usual "Flush" habits, forgoing laundry, etc.
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Old 01-26-2016, 08:18 AM   #26
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It's the formulae C+E-C= TO. Or Consumption + Elimination - Constipation= Total Output.
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Old 01-27-2016, 04:27 PM   #27
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It'd be nice to know how big your tanks are.
While hooked up, I go 3-4 days on black.
If needed we can go a week for both tanks which at that point we'd be out of fresh water anyway.
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Old 01-28-2016, 04:40 PM   #28
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Quote:
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You can add a shutoff valve to your dump hose connection point to allow your grey water to flow over to your black water tank and extend the number of days between dumps. One of the best additions I've made to our RV and it cost less than $20.

Very inquisitive. I have never heard of the extender valve. My only problem?? My tanks are the factory installed. So it's all fitted plumbing. Don't know if installation of such a valve would even be possible on my Motorhome.
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