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Old 01-08-2022, 06:44 PM   #1
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Question Waste pump?

We are converting a 40' rear engine skoolie into a mobile homeless outreach bus with a bathroom. The bathroom is behind the rear wheels and the black tank has to be in front of the wheels, about 5' forward of the toilet. Do we need some type of waste pump from the toilet to the tank? The tank is 40 gallons.

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Old 01-12-2022, 06:23 PM   #2
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Toilet should be directly over the black tank.
RV toilets are pretty much a bowl with a pipe straight down to the black tank.
Otherwise you will need a macerator toilet with a pump to move the waste to the black tank. They are mainly used (in the US) if your bathroom is in a basement and your sewer connection is at ground level. Think of a toilet, blender, and water pump combined.

They are not inexpensive, and clog very easily.
Sanitary products and even toilet paper can clog it. There was one at a private marina I had a boat at. It was used part time by 15 boat owners, and it needed to be taken apart, cleaned out and reassembled about once a month. And there was a trash bag we were supposed to out our used toilet paper in that stunk to high heaven.
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Old 01-12-2022, 09:30 PM   #3
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You would need to pump the sh*t up over the rear axle. That looks to be about a thousand bucks.

If you had the toilet on a pedestal, and ran the sewage pipe inside the wheels you might be able to do a gravity drop.
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Old 01-13-2022, 06:53 AM   #4
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Quote:
Originally Posted by Mr_Geenie View Post
Toilet should be directly over the black tank.
RV toilets are pretty much a bowl with a pipe straight down to the black tank.
Otherwise you will need a macerator toilet with a pump to move the waste to the black tank. They are mainly used (in the US) if your bathroom is in a basement and your sewer connection is at ground level. Think of a toilet, blender, and water pump combined.

They are not inexpensive, and clog very easily.
Sanitary products and even toilet paper can clog it. There was one at a private marina I had a boat at. It was used part time by 15 boat owners, and it needed to be taken apart, cleaned out and reassembled about once a month. And there was a trash bag we were supposed to out our used toilet paper in that stunk to high heaven.

even boat toilets are a royal PITA.. a Homeless guy tries to catch a couple puffs of a cig in the bathroom and flushes a cigarette can mess up a boat toilet.. a candy wrapper even..



those macerator pumps often used in basement bathrooms of houses where the sewer line isnt deep enough are a PITA also.. they are very powerful motors and have a heck of a surge current on startup too.. they work best in a narrow deep pit as opposed to a shallow tank.. they also need LOTS of water to move the solids or they block up.. something not condusive to being on tank-water in a bus..
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