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Old 02-26-2018, 09:56 PM   #1
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size of fresh water/grey water tanks...

i've been searching the threads... maybe someone can direct me to an older discussion...

we are a family of 5 on the bus... 2 adults, a 10-year old boy, an 8-year old boy, and a 6-year old girl.

our plan is to have a composting toilet, so no black water tank.

we will have an outdoor shower and plan on using state parks or truck stops for thorough cleaning of the children.

the plan is to safely and securely mount our fresh water tank(s) under our bed at the read of the bus, either one tank centered, or two tanks on the sides. we plan on mounting our grey water tank under the bus, opposite of the gas tank (so between the tires on the driver side).

looking for suggestions of how big of a fresh water tank (or two) and how big of a grey water tank.

thank you in advance.
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Old 02-26-2018, 10:34 PM   #2
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How low on fresh do you want to be able to go without dumping gray? That will help decide fresh and gray sizes.
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Old 02-26-2018, 10:37 PM   #3
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Originally Posted by simplyusandabus View Post
i've been searching the threads... maybe someone can direct me to an older discussion...

we are a family of 5 on the bus... 2 adults, a 10-year old boy, an 8-year old boy, and a 6-year old girl.

our plan is to have a composting toilet, so no black water tank.

we will have an outdoor shower and plan on using state parks or truck stops for thorough cleaning of the children.

the plan is to safely and securely mount our fresh water tank(s) under our bed at the read of the bus, either one tank centered, or two tanks on the sides. we plan on mounting our grey water tank under the bus, opposite of the gas tank (so between the tires on the driver side).

looking for suggestions of how big of a fresh water tank (or two) and how big of a grey water tank.

thank you in advance.
Lots of opinions on this subject...a group that large is gonna need a system more responsive than a composting system...just my 2cents...having a over-taxed septic system will curse your entire adventure...

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Old 02-27-2018, 12:19 AM   #4
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Originally Posted by o1marc View Post
How low on fresh do you want to be able to go without dumping gray? That will help decide fresh and gray sizes.


A week at minimum. Hoping to not use an insane amount of water since weíre not doing an in-bus shower. Just the outdoor one.


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Old 02-27-2018, 12:21 AM   #5
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Lots of opinions on this subject...a group that large is gonna need a system more responsive than a composting system...just my 2cents...having a over-taxed septic system will curse your entire adventure...

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Iíve gone back and forth on this very issue. My wife really wants to do the composting system...


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Old 02-27-2018, 07:43 AM   #6
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a few years back, I read that a single person averages 30 gallons of water per day. I'd say that's very conservative. I use a bit more than that when I'm home. However, that average is including so many toilet trips, a shower, bushing teeth, and I assume washing dishes and clothes. I have done some long trips on my motorcycle with all camping. I have my water usage down to 3 liters per day. This includes all water I use for brushing teeth, showering, dishes, eating, and drink. Most of it is for drinking.
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Old 02-27-2018, 08:05 AM   #7
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a few years back, I read that a single person averages 30 gallons of water per day. I'd say that's very conservative. I use a bit more than that when I'm home. However, that average is including so many toilet trips, a shower, bushing teeth, and I assume washing dishes and clothes. I have done some long trips on my motorcycle with all camping. I have my water usage down to 3 liters per day. This includes all water I use for brushing teeth, showering, dishes, eating, and drink. Most of it is for drinking.
3 liters a day is a bit extreme, but 3 gallons a day is very comfortable.

That way, your 50 gallon tank should get a couple off-grid for at least a week.
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Old 02-27-2018, 10:08 AM   #8
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3 liters a day is a bit extreme, but 3 gallons a day is very comfortable.

That way, your 50 gallon tank should get a couple off-grid for at least a week.
3 liters is me living off my motorcycle. 3 gallons a day average is easily achievable for me. My SO on the other hand.
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Old 03-02-2018, 11:47 AM   #9
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Iíve found 42 gallon tanks and 100 gallon tanks... thoughts?


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Old 03-02-2018, 12:37 PM   #10
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I have lived several years full time and found that 10 gallons per person per day worked out to be a good rule of thumb for us. IF we did our laundry elsewhere.

Throw frugal laundry into the mix and you can double that.

This does assume that you take conservation steps. Never run water unless it is doing some kind of "work". Don't leave it running while brushing teeth or washing dishes.

Navy showers help to.
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