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Old 05-08-2017, 10:08 PM   #1
Mini-Skoolie
 
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Can a gray water tank be installed in the bus not under?

I just bought a mid-sized bus and I am planning on installing a composting toilet so no black tank needed. I just need a fresh water tank and a gray water tank. Does a gray water tank always need to be installed under the bus? Or can I have both of the tanks in the bus? If so, for weight distribution, where should I put the tanks. I plan on having an open area towards the back of the business to use as storage area (for bikes, grocery shopping, etc) so I don't plan on having a fresh water tank under a bed frame. Maybe the fresh water tank could be under the seatin area? Not sure about the gray tank though. Any help would be appreciated.
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Old 05-08-2017, 10:24 PM   #2
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You can install the grey water tank inside as long as it is vented outside. To drain your fixtures, simply install a small sump pump under each sink. They cost only ~$40 on ebay.

Just search for "marine shower sump pump" on eBay to find them.

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Old 05-08-2017, 11:30 PM   #3
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Have you tried custom tanks to fit the space you have available underneath?
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Old 05-08-2017, 11:41 PM   #4
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you could get a 30g tank under a sink in a cabinet ok. you could plumb the waste out either on the side or down through the floor.

in the winter, it would be handy to have the water enclosed in a living area.
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Old 05-09-2017, 08:31 AM   #5
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Hi Bill, I've never heard of a marine shower sump pump before. Would that sump pump be submerged in the gray water tank and then turn on when I want to kick the water out of the bus? And when you say "make sure it's vented to the outside" would that mean cutting a hole on the side of the bus where the hose to the sump pump can kick the water out? I'm so sorry if these questions are so basic.
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Old 05-09-2017, 08:38 AM   #6
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Originally Posted by Robin97396 View Post
Have you tried custom tanks to fit the space you have available underneath?

I have not thought about cusom sized tanks. One of the issue I have is finding tanks that fit the spaces inside my bus. Who makes custom tanks?
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Old 05-09-2017, 08:51 AM   #7
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No RV Place Will Work On Bus Conversions

The reason I'm asking if the gray water tank can be inside the bus is because I called 2 of the biggest rv companies here in Omaha and asked if they could work on a bus conversion and they stated no. I don't know how to install a tank underneath the bus so I was looking for an alternative. So I understand I can fit a tank underneath the sink or cabinet close to the sink. What would be the best option for getting the water out. Just carry it out and manually dump it? There was a reply on here to use a marine sump pump but I can't envision how that would work.
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Old 05-09-2017, 09:50 AM   #8
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The marine shower sump pump is a small plastic tank (~1/2gl)with a pump in it. The pump runs on dc power. You mount it under your sink or shower and run the sink drain into it. I used a waterless trap between the sink and the sump to prevent odors. The pump in the tank pumps the water to your waste tank. The pump outlet is a barb fitting so a 3/4" or 1" inch hose can run to your waste tank. And it is pumped so it can even flow uphill.

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Old 05-09-2017, 10:34 AM   #9
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Quote:
Originally Posted by miltruckman View Post
The marine shower sump pump is a small plastic tank (~1/2gl)with a pump in it. The pump runs on dc power. You mount it under your sink or shower and run the sink drain into it. I used a waterless trap between the sink and the sump to prevent odors. The pump in the tank pumps the water to your waste tank. ...

Bill
Hi Bill,
This is a great idea. Is the marine shower sump similar to a Sani-Flo??
A marine sump would likely be smaller though.
I'm negotiating with a seller to get my 1st schoolie. Fine tuning my
build plans, and this thread is perfect timing for similar questions I
have. Prefer an interior GW tank given the very cold Canadian climate...
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Old 05-09-2017, 11:43 AM   #10
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Thank you for the explanation Bill.
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