Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
Old 03-16-2015, 11:25 PM   #1
Senior Member
 
Join Date: Apr 2014
Location: Gainesville, FL
Posts: 4,620
Gray overflow to black?

We have 1 gray tank and 1 blank tank, both 36 gallons. We typically will fill the gray tank well before the black tank. Having a practical means of shifting some gray drainage into the black tank would be useful, but I'd rather not do that manually with buckets, trekking it into the toilet.

In another thread I saw a reference to plumbing mods to allow shifting some gray water overflow to the black water tank. I used search and browsed lots of thread but can't find any mention of such a modification. Can someone point me to a description?

Thanks
__________________
TV: 2021 Ford F-150 4WD XLT Crew w/ 3.5L EB & HDPP, payload: 2,416#.
RV: 2020 Rockwood Mini-Lite 2507S, Propride 3P hitch w/ 1400# spring bars

Camping nights: 2021, 52; 2022, 99; 2023, 88; 2024, TBD (Est: 80+)

chriscowles is offline   Reply With Quote
Old 03-17-2015, 07:35 AM   #2
Senior Member
 
Join Date: Jun 2013
Posts: 359
no mods yet i just take a 5 gal bucket and either dump the gray down my potty if boon docking or down the bath house if camping. i would be interested in maybe adding a mod if it did not take major changes
__________________
2013 Ram 1500 (5.7)
2014 Rockwood Mini Lite 2104s
https://i307.photobucket.com/albums/n...ps412bc14c.jpg
Prothos is offline   Reply With Quote
Old 03-17-2015, 07:53 AM   #3
Senior Member
 
Join Date: Jul 2010
Location: Waynesville
Posts: 14,428
Water and ?? seeks its own level! Trying to balance both tanks is a (Messy) idea with very Little gain! Youroo!!
youroo is offline   Reply With Quote
Old 03-17-2015, 08:03 AM   #4
Senior Member
 
Join Date: Apr 2014
Location: Gainesville, FL
Posts: 4,620
I'm skeptical, too, but am willing to consider the option if someone else invented a way. There are geniuses among us.
__________________
TV: 2021 Ford F-150 4WD XLT Crew w/ 3.5L EB & HDPP, payload: 2,416#.
RV: 2020 Rockwood Mini-Lite 2507S, Propride 3P hitch w/ 1400# spring bars

Camping nights: 2021, 52; 2022, 99; 2023, 88; 2024, TBD (Est: 80+)

chriscowles is offline   Reply With Quote
Old 03-17-2015, 08:24 AM   #5
Moderator Emeritus
 
Dave_Monica's Avatar
 
Join Date: Sep 2007
Location: Ontario, Canada
Posts: 4,327
I don't see anyway to cross-connect the two tanks without contamination of one to the other ie black into gray. The bucket method may be low tech but it's the best solution.


Dave
__________________


Nights camped in 2013 - 55, 2014 - 105, 2015 - 63
Dave_Monica is offline   Reply With Quote
Old 03-17-2015, 10:30 AM   #6
Senior Member
 
Join Date: Apr 2014
Location: Gainesville, FL
Posts: 4,620
When dumping full tanks I briefly hold both camera open but only after the black tank is fully drained and the gray tank is still full. I then close the gray valve promptly and allow the black tank to drain again. After that I close the black valve and don't allow communication between the two. Any further rinsing of the black tank is by way of a clear segment with attached hose.
__________________
TV: 2021 Ford F-150 4WD XLT Crew w/ 3.5L EB & HDPP, payload: 2,416#.
RV: 2020 Rockwood Mini-Lite 2507S, Propride 3P hitch w/ 1400# spring bars

Camping nights: 2021, 52; 2022, 99; 2023, 88; 2024, TBD (Est: 80+)

chriscowles is offline   Reply With Quote
Old 03-17-2015, 11:20 AM   #7
Senior Member
 
vinmaker's Avatar
 
Join Date: Jul 2014
Location: MA
Posts: 1,830
The most practical way would be to simply install a connection hose from the grey to the black. As was pointed out, water will seek its own level. You therefore need to pump the grey water up and out of the tank and then deposit it into the black. This is really a simple Mod. Just need a bit of hose and a small pump.

Vin.
__________________

2015 HW296
2006 HW256 (previous pup)
2013 Chevy Tahoe
Equalizer WDH 10000#
vinmaker is offline   Reply With Quote
Old 03-17-2015, 12:27 PM   #8
Senior Member
 
Join Date: Feb 2015
Posts: 114
Really don't want to cross connect the gray and black. Keep two separate systems. GOD forbid somehow a cross connect and blocked black tank sewage will flow up into the shower, sinks etc.
__________________
FOREST RIVER FW 8524RLWS
2010 FORD F 150 5.4
#1-18' Nomad #2- 20' Mallard #3- 27' Sunline #4- Four Winds C #5- Innsbruck 40' PARK # 6- 28' Amerilite #7- Forest River 26.5 FW ( 1st FW)
SULTINI is offline   Reply With Quote
Old 03-17-2015, 12:45 PM   #9
Always Learning
 
ependydad's Avatar
 
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,892
Warnings aside, I've read of other folks using a valve at the sewer connection and using it to equalize the tanks:



I've never done it, though.
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
ependydad is offline   Reply With Quote
Old 03-17-2015, 01:45 PM   #10
Senior Member
 
Join Date: Apr 2014
Location: Gainesville, FL
Posts: 4,620
I do something like that by opening the gray valve after the black tank is empty but only if the gray tank is relatively full, to reduce the likelihood of backwash.
__________________
TV: 2021 Ford F-150 4WD XLT Crew w/ 3.5L EB & HDPP, payload: 2,416#.
RV: 2020 Rockwood Mini-Lite 2507S, Propride 3P hitch w/ 1400# spring bars

Camping nights: 2021, 52; 2022, 99; 2023, 88; 2024, TBD (Est: 80+)

chriscowles is offline   Reply With Quote
Old 03-17-2015, 01:52 PM   #11
Senior Member
 
vinmaker's Avatar
 
Join Date: Jul 2014
Location: MA
Posts: 1,830
Quote:
Originally Posted by SULTINI View Post
Really don't want to cross connect the gray and black. Keep two separate systems. GOD forbid somehow a cross connect and blocked black tank sewage will flow up into the shower, sinks etc.
Right. That would be another issue.
__________________

2015 HW296
2006 HW256 (previous pup)
2013 Chevy Tahoe
Equalizer WDH 10000#
vinmaker is offline   Reply With Quote
Old 03-17-2015, 02:04 PM   #12
Senior Member
 
Join Date: Feb 2015
Posts: 114
Quote:
Originally Posted by chriscowles View Post
I do something like that by opening the gray valve after the black tank is empty but only if the gray tank is relatively full, to reduce the likelihood of backwash.
Me Too
__________________
FOREST RIVER FW 8524RLWS
2010 FORD F 150 5.4
#1-18' Nomad #2- 20' Mallard #3- 27' Sunline #4- Four Winds C #5- Innsbruck 40' PARK # 6- 28' Amerilite #7- Forest River 26.5 FW ( 1st FW)
SULTINI is offline   Reply With Quote
Old 03-17-2015, 04:16 PM   #13
Blog: RVroadtripper.com
 
hbillsmith's Avatar
 
Join Date: Jul 2012
Location: Near Dallas Texas
Posts: 1,000
I have 2 gray tanks. 50 gal each, 1 is kitchen, 1 is Bath/shower. Bath tank fills in a couple days, kitchen in a couple weeks (we use a small tub to wash dishes and dump it outside cause we dont want food remnants in our linescthat would build up or attract bugs). Read somewhere to keep dump cap on and open both greys so theycwould level out. Tried it once and what happened was both greys emptied and leaked over into the closed black tank which immediately showed full. No nasties because we werent using the black yet. I may have a black valve leak on this new 5er.
__________________
2016 Wildcat 295RSX - 2015 GMC 2500HD DblCab Duramax/Allison 4x4 Z71 6.6' Bed
Maxxis 235/80/16E; AirBags w/AirLift1; mor/Ryde Rubber Pinbox; Andersen UltimateII Alum. 5erhitch on Reese Flipball w/Curt 4" offset; LCI Ground Control3; King Dishtailgater; Traveling with 10' Portabote;
hbillsmith is offline   Reply With Quote
Old 04-01-2015, 08:22 PM   #14
Member
 
Join Date: Aug 2014
Posts: 43
RV Grey Water Potty Flush | ModMyRV

I'm thinking this might be the mod the original poster was talking about. Cool idea, but a bit more work than I'm willing to do. The bucket method will continue for me.
__________________
2012 Grey Wolf DBH

1999 Lincoln Navigator 4X4 5.4L 32v Intech
Ryno22980 is offline   Reply With Quote
Old 04-01-2015, 10:26 PM   #15
Senior Member
 
Join Date: Apr 2014
Location: Gainesville, FL
Posts: 4,620
I did see that and agree it's overkill but was referring to this thread on this FR site. The reference was vague, which is why I asked. It sounded to me like the overflow was passive but would have to be one-way.

I guess I could inquire with the member who posted that comment but I only just found it again.

EDIT: I tried to reply to the thread but it's ancient, and closed. Also, the member (Triguy) hasn't posted a message since August. I sent a PM in the hope that he's still around. Maybe others here will recall that topic and know what he was referring to.
__________________
TV: 2021 Ford F-150 4WD XLT Crew w/ 3.5L EB & HDPP, payload: 2,416#.
RV: 2020 Rockwood Mini-Lite 2507S, Propride 3P hitch w/ 1400# spring bars

Camping nights: 2021, 52; 2022, 99; 2023, 88; 2024, TBD (Est: 80+)

chriscowles is offline   Reply With Quote
Reply

Tags
black

Thread Tools
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


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 01:23 AM.