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Old 03-22-2019, 11:47 PM   #1
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Save grey water to flush toilet?

I'm in middle if finally getting to my remodel of my beastie.

Looking at small washer/dryer options. What came to mind is has anyone figured out or tried to come up with a way to add a pump on the grey water tank (with a switch in bathroom just like freshwater pump) that can use maybe the top 2/3rds of the tank to flush the toilet?

I see a challenges like shunting or switching flush water. Like how to keep flush water holes in toilet unclogged? a few things like that...

Just seems a real waste of clean water to flush with. I'm sure there is a reason it's not done or that this is a new idea... but......??
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Old 03-23-2019, 12:58 AM   #2
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Well, do you want to use dirty sink water for your bidet?
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Old 03-23-2019, 01:21 AM   #3
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Have you googled? Try 'RV grey water reuse'. Commercial and DIY solutions.
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Old 03-23-2019, 04:52 AM   #4
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Grey water to flush toilet

I would think that because your "grey" water is a collection of bathroom sink water, shower water, clothes washer water, kitchen sink water, and in some cases automatic dish washer water....that you would want some type of course filter in line to catch lint and food particles. Without this type of filter you will likely have toilet or water pump issues. I personally don't see an advantage unless you're a serious BOONDOCKER....and even then it may not be worth the cost and aggravation.
If you do try it .... Let us know how it works for you 🤔
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Old 03-23-2019, 07:06 AM   #5
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Before I use the toilet for 2 I want more water in the bowl than normal. I will dump the dish pan for that...
My Dad had me put a extra drain in the grey tank so he could drain the top 1/4. Could bucket that to toilet, if carrying water was not below your dignity...
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Old 03-23-2019, 07:12 AM   #6
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If you are remodeling you should consider a separate tank for the washer.Then it would only have soapy water with a little lint, not food particles .
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Old 03-23-2019, 07:18 AM   #7
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Grey water in itself does turn septic, it smells. It will contain solids and soap residue which will play havoc on your toilet valve and water inlet. It also has bacteria. This would be a last ditch solution to try and conserve water and or redistribute grey to black tank.

When we boon dock we conserve water as much as possible. We go to extremes to conserve water.
  1. When we get ready to take a shower we catch the cold water in a pot and use it for cooking or coffee. We also take navy shower, wet down and shut off water, soap up, then rinse off.
  2. When we do dishes we catch the water in a plastic tub and will either dump it down the toilet or if in an acceptable area dump it outside.
  3. We keep a spray bottle, that has a strong narrow stream, next to the toilet. Instead of completely filling the toilet and or continual flushing when doing a #2 we use the spray bottle to clean the toilet. We usually put some pinesol or other deodorizer in the bottle to help clean and provide odor control.
  4. If we have a guest we enforce the above, it's our house, they play by our rules.
Works for us.
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Old 03-23-2019, 07:20 AM   #8
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Consider a composting toilet, gray water can smell quite bad at times.
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Old 03-23-2019, 11:48 AM   #9
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Boondockers typically save their dish water and catch the running shower water while the hot comes in. Then they use it for flushing thereby saving their fresh water in the tank. They save it in either a bucket or pour it into a jug.


If you're in RV parks with hookups there's no need to do this.
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Old 03-23-2019, 12:35 PM   #10
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I don't boondock much but if I did I would install a separate pump fed as suggested from part way up the grey tank. They make & sell diaphram pumps that do not clog like a std fresh water pump.... they are used frequently on boats to pump sink & shower water overboard. I would plumb it to a 2nd spray head to add water & flush with without the need to make a fresh / grey water connection at the toilet that can / will be a source of contamination of fresh water.
Side benefit is that this can be used to transfer grey to black tank if/when desired.
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Old 03-30-2019, 08:04 PM   #11
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Quote:
Originally Posted by Scatterbrain View Post
Well, do you want to use dirty sink water for your bidet?
for that unique "road funk not so fresh feeling?" 😛
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Old 03-30-2019, 08:05 PM   #12
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Quote:
Originally Posted by vsheetz View Post
Have you googled? Try 'RV grey water reuse'. Commercial and DIY solutions.
actually no... thanks. i get used to seeing anything here so i get a tad lazy and spoiled.
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Old 03-30-2019, 08:06 PM   #13
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Quote:
Originally Posted by LSBEH View Post
I would think that because your "grey" water is a collection of bathroom sink water, shower water, clothes washer water, kitchen sink water, and in some cases automatic dish washer water....that you would want some type of course filter in line to catch lint and food particles. Without this type of filter you will likely have toilet or water pump issues. I personally don't see an advantage unless you're a serious BOONDOCKER....and even then it may not be worth the cost and aggravation.
If you do try it .... Let us know how it works for you 🤔
agreed. i mentioned, or thought about mentioning, the clogging issue. i figure thats for the folks smarter than mr to teach me.
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Old 03-30-2019, 08:08 PM   #14
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Quote:
Originally Posted by ScoobyDoo View Post
Before I use the toilet for 2 I want more water in the bowl than normal. I will dump the dish pan for that...
My Dad had me put a extra drain in the grey tank so he could drain the top 1/4. Could bucket that to toilet, if carrying water was not below your dignity...
nice solution. i really think its an interesting idea. otherwise that water just goes to "waste"... ouch, nasty pun there... oops
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