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Old 03-03-2019, 09:51 PM   #1
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Default Macerator Toilet using Gray Water Flush?

After watching the latest video from Advanced RV and seeing they did a van with a marine macerator toilet I did some research. The Saniflo SaniMarin Maxlite toilet is designed with a self priming pump to use an unpressurized water source. It is a marine toilet that normally just uses water from the boats environment. It is also used in RVs. The installation instructions say not to connect to fresh water tank because of risk of contamination of fresh water. Then a thought occurred that this could be the perfect solution for a system to use Gray water for toilet flushing in a B-van. A simple water line from Gray tank to the toilet would do the job. Adding a filter might be a good idea.

The toilet is sold by Home Depot and many other sources. It is made in France. Here is link to a 12V version on HD site, which has details...

https://www.homedepot.com/p/Saniflo-...-078/301835692

So is this a crazy idea or a possibility? Certainly ARV could do it as they already have experience with macerator toilet in a 144" Sprinter van. I'll have to ask ARV, they may have already done it on the ARVEE build featured in the video.
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Old 03-03-2019, 10:32 PM   #2
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After watching the latest video from Advanced RV and seeing they did a van with a marine macerator toilet I did some research. The Saniflo SaniMarin Maxlite toilet is designed with a self priming pump to use an unpressurized water source. It is a marine toilet that normally just uses water from the boats environment. It is also used in RVs. The installation instructions say not to connect to fresh water tank because of risk of contamination of fresh water. Then a thought occurred that this could be the perfect solution for a system to use Gray water for toilet flushing in a B-van. A simple water line from Gray tank to the toilet would do the job. Adding a filter might be a good idea.

The toilet is sold by Home Depot and many other sources. It is made in France. Here is link to a 12V version on HD site, which has details...

https://www.homedepot.com/p/Saniflo-...-078/301835692

So is this a crazy idea or a possibility? Certainly ARV could do it as they already have experience with macerator toilet in a 144" Sprinter van. I'll have to ask ARV, they may have already done it on the ARVEE build featured in the video.

Based on what most grey tanks smell like, probably not unless you could get rid of the smell.
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Old 03-03-2019, 10:37 PM   #3
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This kit has been around awhile that uses a pump to send the grey water though a filter to be used for flushing the toilet. Easy to put together without buying the kit. The macerator toilet may not need the pump if it can pull the grey water through the filter...

Dry Camp Longer With A DIY Gray Water Recycling System
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Old 03-03-2019, 11:53 PM   #4
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This kit has been around awhile that uses a pump to send the grey water though a filter to be used for flushing the toilet. Easy to put together without buying the kit. The macerator toilet may not need the pump if it can pull the grey water through the filter...

Dry Camp Longer With A DIY Gray Water Recycling System
I'm familiar with the USI-RV system...

https://www.usi-rv.com/product.sc?pr...7&categoryId=2

I see it does include a filter that they claim gets rid of the odors. The use of a macerator toilet just serves as the second water pump needed in the USI-RV system. A macerator toilet might give one the flexibility to place the toilet anywhere, by allowing it to be some distance from the Black tank. The idea of reusing Gray water has some appeal on a small van with limited tank space. But my experience with a 12 gallon black tank - it is almost always my limiting factor traveling with two people.

Just some more out of the box thinking.
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Old 03-04-2019, 01:29 AM   #5
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The installation instructions say not to connect to fresh water tank because of risk of contamination of fresh water. .
Mmmm. I wonder how contamination of fresh water could occur? AS installed a SeaLand Master Flush macerator toilet in my Avenue. Fresh water simply fills from the top rim by gravity like every other toilet. This one must be different in some critical way.
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Old 03-04-2019, 03:12 AM   #6
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Mmmm. I wonder how contamination of fresh water could occur? AS installed a SeaLand Master Flush macerator toilet in my Avenue. Fresh water simply fills from the top rim by gravity like every other toilet. This one must be different in some critical way.
.
It sucks water from outside the boat ...

https://images.homedepot-static.com/...c97ec83ac2.pdf
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Old 03-04-2019, 05:36 AM   #7
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It sucks water from outside the boat ...

https://images.homedepot-static.com/...c97ec83ac2.pdf
Still not sure how it contaminates fresh water.
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Old 03-04-2019, 05:54 AM   #8
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I would assume that the fresh water system has built-in an inline check valve and they can fail. Any debris can cause them to get stock open and the waste could contaminate the fresh water tank.
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Old 03-04-2019, 06:05 AM   #9
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For an RV you could hook the fresh water intake to a gravity feed water tank that is filled manually or filled from the fresh water system. As long as there is no direct connection from the toilet water inlet line to the fresh water system there is no possibility of contamination.
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Old 03-04-2019, 02:23 PM   #10
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Mmmm. I wonder how contamination of fresh water could occur? AS installed a SeaLand Master Flush macerator toilet in my Avenue. Fresh water simply fills from the top rim by gravity like every other toilet. This one must be different in some critical way.
.
Good to know - I'll have a look at the SeaLand model. It probably uses pressurized water via your normal water pump. The SaniMarin model I mentioned in my first post has its own built in water pump.

Does your macerator toilet use a lot of water? From the other research I did it sounds like macerator toilets use more water than a standard RV toilet mounted on top of the Black tank.

I use very little water with my Interstate Dometic toilet.
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