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Old 06-16-2018, 08:47 PM   #1
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Gray Water w/ Reverse Osmosis?

Thinking of doing some extended boondocking next summer, and looking to do some modifications prior to this, first of all being solar. Next I am looking at a composting toilet.

I was wondering if anybody has hooked their gray water into a reverse osmosis system. Pump out the gray water, pass it through a sediment filter that can be emptied out, possibly a carbon filter, and then finally reverse osmosis feeding back into the freshwater tank?

Would love to hear the nays and yays of doing this if it is even possible or somebody has tried it.

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Old 06-16-2018, 09:19 PM   #2
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Yes if you can..(but they do have limitations even if you go overboard with battery banks.
Compost toilets systems.....
I am not a big fan of the idea.... manually removing/servicing the solid waste is not a fun thing to be doing..
AND...... just where do you propose to dispose of that "solid/ composted" waste???
Human waste is a bio/hazmat designated material.... and most if not all areas in the US have strict rules for disposal..
WAY more trouble than it is worth..
also don't expect to sell your RV after the conversion...as most prospective purchasers will not be willing to buy it and then have to convert it back to the factory layout..
This also applies to the propane fired "turd burners"

Foretravel with tag axle.
retired truckdriver with 5m miles
Orygun Native
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Old 06-16-2018, 10:09 PM   #3
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The swap would be pretty easy, and putting it back just as easy but I don't plan on selling it anyway.

As for disposing of the poop/compost, I can find no regulations about throwing it away in the trash in a compostable bag. I throw my dogs poop in a trashcan every day (and so does everyone I know) and I'm pretty certain that big dude poops more than I do. By the time I would dispose of it, it would already be respirated and starting the process of composting.
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Old 06-19-2018, 08:37 AM   #4
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I am guessing that the goal you’re trying to accomplish is extending your boondocking time via the composting toilet and recycling the grey water. I wonder if the big limiting factor might be solid waste. If you solve the water question and then go with a composting toilet won’t you still have trash to dispose of? I know you might be able to burn some but not everything. We can go two weeks pretty easily if we are reasonable with water use especially showers but we always have more trash than we want. Is the expense worth the return? How big are your tanks? How many people in your party?
Creekside 23 DBS
2017 Ram Cummins 2500
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Old 06-20-2018, 01:33 AM   #5
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A misconception about RO membranes is that they are efficient. In fact they waste about half of the input water which is expelled through the "brine" port otherwise the cycles of concentration within the housing increases dramatically, lowering product quality and volume. Plus, premature fouling of the expensive membrane pores quickly. Can't imagine the pre-filters would last very long either. We order nominal .6 micron charcoal block type wholesale by the dozen. Not cheap.

Point two, the RO membrane require adequate fluid pressure to operate properly. 50-60 psi as a minimum, 100psi near ideal. Gravity feed won't cut it, so plan on a booster pump. [Desired volume x 24 hrs. @ 75 psi =GPD, [12DC (120VAC)x Amps = watts]

We run a 90 Gal per day @ 100 psi RO unit, [120VAC x 6A. booster] which might, almost fill the 100 gal. holding tank over-night with adequate CG pressure. Potable water in that is.
You might want a dozen survival ceramic drinking straws in your bug-out bag for that grey water smoothie. Or one of those Prison Planet* tabletop model filters.

Most wilderness' do best with runs to a spigot and a 50 Gal bladder in their truck bed, low pressure high volume transfer pump, and a couple Blueboys.

Best of luck
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GM Denali, 3500HD-Max, 4x CC, 8' DRW,
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Old 06-20-2018, 10:43 AM   #6
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Before installing a composting toilet watch this video

2002 Safari Trek 2830 on P32 Chassis with 8.1L
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