Skip to main content ↑ ↓
Topic: Grey and black tanks (Read 630 times) previous topic - next topic

Grey and black tanks

I always let my tanks fill up and then drain when full. Never have problems doing that. Others seem to leave them open when in an rv park!
1995 U320
Build #4677
2011 Honda CRV

Re: Grey and black tanks

Reply #1 –
Quote from: Nigel0434 –
I always let my tanks fill up and then drain when full. Never have problems doing that. Others seem to leave them open when in an rv park!

I do the same as you.

Do all at one time:
dump black first
dump gray second
If you have a tank flush, do that. If not, flush 4-5 toilet's full of water down the black tank and 2 sinks of water down the gray.

Then refill potable water tank.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Grey and black tanks

Reply #2 –
I want a complete flush of black and gray tank. I never leave valves open to drain as being used. Makes me feel better.
Dub McBride 1996 270

Re: Grey and black tanks

Reply #3 –
3rd dump valve mod helps to flush out black tank and dump hose without wasting fresh water.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Grey and black tanks

Reply #4 –
We leave ours closed except to dump, doing it this way cuts down the chance of sewer flies getting into your system.

Mike

Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Grey and black tanks

Reply #5 –
We, too, use our tanks for everything, even when we have FHU. One additional step that I take is to dump a little bit of grey water after hooking up the stinky slinky. That way, if something isn't right, I haven't created a big mess. I learned that trick after watching someone hook up the stinky slinky and pull the black water handle. Unfortunately, he didn't have the hose securely connected at the rig. Big mess and lots of colorful language.

We easily go a week between fill/dump cycles.

Re: Grey and black tanks

Reply #6 –
Plus 1 on leaving the tanks closed until dump!  The only time I leave the grey open is when wife is doing the laundry.  You will only forget to do that once!  Just once!
Joe & Dottie Allen
Sold!  December 2023.      2000 U320; build # 5645
Our coach " Maxine"
Motorcade #  15922;  Escapee 150950; FMCA F330833; Boondockers Welcome;  Harvest Hosts;  Thousand Trails
'98 U320 from 2000-'06
USAF '62-'66

"Do not spoil what you have by desiring what you have not; remember that what you now have was once among the things you only hoped for." ―Epicurus

Re: Grey and black tanks

Reply #7 –
Grey tank can "sour" I use some chemical in the gray and more in the black.

Old shop owner and some old timers use aqua chem.  Politically incorrect. Environmentally unfriendly. 
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4
 

Re: Grey and black tanks

Reply #8 –
We have just a black/ grey tank. But I only dump when it is close to full. I do have a grey water by-pass that can be used while doing laundry. But it doesn't work well. So on wash day, I keep a close eye on the tank and dump when it hit 3/4 full. Does clean out the stinky slinky nicely. Not sure when the single tank was incorporated into the Nimbus ,but that was the way ours was constructed.
Lynn and Linda Day and Harry the pug
RIP: Tank 01-2008 to 03-2020
2012 Nimbus 42' build 6555
ISX12-500hp
2015 Jeep Grand Cherokee
MC# 17723