Thread Tools Search this Thread Display Modes
Old 08-02-2009, 07:16 PM   #1
wmarsha's Avatar
2000 30' Limited
battle ground, , Washington
Join Date: Jun 2009
Posts: 511
Grey Flush

I know this has been asked/answered before, but every search I do ends up with over 400 hits-it takes too long to check on all of them, and then we all do such a wonderful job of spelling, (grey? gray?, etc). So I am going to start a new thread.
Flushing the toilet with fresh water does not make sense to me.

many municipalities nationwide are changing plumbing codes to allow for secondary use of grey water. Usually it is for yard watering, but some instances allow toilet flushing to be done with grey water. Now in a house that obviously requires a grey storage system and pumping system. But in a AS, it's already there! Well, almost.

Most of the above code changes allow only bath, shower, and bath sink grey to be re-used. Kitchen grey water is not usually recycled at the individual house. Well, not yet anyway.

So, with the simple addition of a small gpm pump and some minor plumbing, why cannot the grey water be used to flush the toilet? Now as far as an RV is concerned the kitchen grey and bath grey and black usually end up in the same dump station. I am ignoring grey on the ground right now, because it really isn't germane to this discussion.

I feel confident there are many AS'rs that have made this modification, I am sure this ques has been asked and answered, just one more time for this newbie, okay? thank-you. BTW I have asked Janet to give me pointers on how to narrow my searches.
thanks, ya'll
ol' bill the newbie

wmarsha is offline   Reply With Quote
Old 08-02-2009, 07:41 PM   #2
Rivet Master
Commercial Member
bredlo's Avatar
1954 22' Safari
Deerfield , Illinois
Join Date: May 2003
Posts: 1,419
Images: 23
Send a message via AIM to bredlo
Great question, great idea for getting the most out of your on-board resources, and I look forward to seeing what others have done.

bredlo is offline   Reply With Quote
Old 08-02-2009, 08:11 PM   #3
Rivet Master
3 Dog Nite's Avatar
Currently Looking...
1989 34.5' Airstream 345
Cleveland , Tennessee
Join Date: Jul 2007
Posts: 787
RV'ers keep the grey & blackwater separate because of the enzymes & good bacteria. They help break down the solids in the black tank. The tank will clog up if solids stay solid. They can be combined in the dump station as most tanks will be pumped out & taken to a treatment facility. Soaps, alcohol from mouthwash, & other chemicals kill the enzymes & bacterias. Ricky
"Sometimes I wonder if the world is being run by smart people who are putting us on, or by imbeciles who really mean it." Mark Twain

AIR 22749 WBCCI 2349 NOVA TAC TN-6
1989 345 LE Classic Motorhome
3 Dog Nite is offline   Reply With Quote
Old 08-02-2009, 09:36 PM   #4
wmarsha's Avatar
2000 30' Limited
battle ground, , Washington
Join Date: Jun 2009
Posts: 511
thanks, ricky, i think those are good points. to expand on my thinking a little: saves fresh water; saves grey tank capacity. I would think that a grey tank connection at a point where very few if any solids would be picked up would be best; the plumbing would include a strainer/filter in front of the pump. The existing fresh water connection to the toilet could be used with a hand sprayer to use fresh water rinse once in awhile. If eco-friendly "stuff" is used in grey water, I see no reason not to do this. Now, what if you had no fluids in the grey tank to flush with? well, again, the hand sprayer should get you past that situation. or, run a little water into the grey tank. after a more involved search i found some info on new AS's being equipped with only one holding tank. Not a good idea in my mind. Also, many folks say their grey tank fills up fairly fast...and do not like the idea of backing some grey into the black tank via a closed dump connection and open dump valves (both tanks). The question of whether or not grey water can be dumped directly onto the ground-both legally and ethically, is one each of us will have to face as we travel. BUT this mod would not affect that capability, as it puts grey directly into the black, not vice-versa. sounds like a future project-new pump for the regular system, use the old one on this mod...a little pex, a filter and there ya have it. Only problem is that dang belly pan...
wmarsha is offline   Reply With Quote
Old 08-02-2009, 10:45 PM   #5
Rivet Master
TBRich's Avatar

2006 19' Safari SE
Tucson , Arizona
Join Date: Jun 2007
Posts: 4,507
Images: 64
While in theory it may make good sense to use grey water for toilet flushing, there are some points to take into consideration:

1. Grey water tank contents, while certainly not as "toxic" as black tank contents, can get pretty foul, odorous, and with greasy buildup...
2. Grey water does have bacteria content to varying degrees, depending on the situation... (what went down the drains, how longs it's been in the tank, how warm it is, etc...)
2. Grey water does have some solid content (food particles, hair, etc) and any filtering system would probably require almost constant monitoring/cleaning in order to ensure water flow...

I'm sure there are other things that need to be considered if one thinks about it... Just some things to think about.
TB & Greg and Abbey Schnauzer
AirForums #21900 . Prez & Membership Chair, 4CU/WBCCI
Travel Log: AZBambi...On the Road Again
TBRich is offline   Reply With Quote
Old 08-03-2009, 07:30 AM   #6
Rivet Master
memgrove2000's Avatar
Elkhart , Indiana
Join Date: Mar 2008
Posts: 633
Send a message via AIM to memgrove2000
This sounds like a neat idea. You might want to look at a small "trash" pump. that would be able to handle the "solids" that might be in the grey tank. or a "macerator" type pump. Just a thought.

Have a great day!

TAC # IN 1 Air#27922
memgrove2000 is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Flush Riveting truckasaurus Ribs, Skins & Rivets 3 06-22-2009 10:06 PM
Tank Flush trailerpup 2006 - 2010 International 12 01-27-2008 02:56 PM
No Fuss Flush Leaks! dpope 2003 Safari 7 06-25-2005 02:48 PM
Do you have tank flush? cosmotini 2002 - 2005 International 8 04-22-2004 09:29 PM
Flush out connection JLD Waste Systems, Tanks & Totes 2 01-04-2003 09:06 PM

Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:04 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.