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

Go Back   iRV2 Forums > COMMUNITY FORUMS > General Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 07-09-2022, 03:41 PM   #1
Join Date: Jan 2019
Posts: 61
how much water do you leave when storing

Just wondering how much water you leave in your black and gray tank when you store. We live in California and it is pretty dry, and sometimes we don't take it out for three months or so. I always try and go check the level of water in the toilet to keep the seal wet, but not sure I am leaving enough water in the black and gray to keep from drying out. Any suggestions how to make sure?
pmaen is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-09-2022, 06:11 PM   #2
Senior Member
Join Date: Aug 2017
Posts: 1,849
I completely drain my tanks when I return from a trip.
1993 Tiffin Allegro Bay 32'
Soppy is offline   Reply With Quote
Old 07-09-2022, 06:33 PM   #3
Senior Member
astrnmrtom's Avatar
Join Date: Sep 2013
Location: Pacific Northwest
Posts: 1,931
Usually empty. In freezing temps I'll pour some RV antifreeze in the tanks and the toilet bowl.
Tom and Pris M. along with Buddy the 17 year old Siamese cat
1998 Safari Serengeti 3706, 300HP Cat 3126 Allison 3060, 900 watts of Solar.
Dragging four telescopes around the US in search of dark skies.
astrnmrtom is offline   Reply With Quote
Old 07-09-2022, 06:38 PM   #4
Senior Member
Duster73's Avatar
Join Date: Mar 2021
Posts: 427
Between trips I fully dump both tanks then add 3 to 5 gallons of water to the black tank with an additive. Then a gallon or so in the grey tank. Fresh water tank gets dumped after each trip. This is usually not much water.

When I winterize I add a gallon of antifreeze to each tank and a little to the traps. Then completely empty fresh water tank. But I am in MI so this part might not apply to you.
"A Man's Gotta Do What a man's Gotta Do"
2000 Fleetwood Southwind Storm 30H- Workhorse
2016 Prime Time Tracer 3150BHD
Duster73 is offline   Reply With Quote
Old 07-09-2022, 08:14 PM   #5
Senior Member
RVFunlovers's Avatar

Entegra Owners Club
Spartan Chassis
Join Date: Oct 2017
Posts: 1,190
We tend to use our coach often. We dump at the campground but often use some water on the trip home. I do not have an easy way to dump at home and it has not bothered me to leave the gray or black tank for a month or so. If you are going to winterize then it is best to start empty.

If I leave the coach for more than a few weeks we dump the fresh water when we get to a RV park and refill it fresh.
Hal and Pam
2022 Entegra Cornerstone W
2020 Ford Edge ST
Sold 2017 Entegra Cornerstone B
RVFunlovers is offline   Reply With Quote
Old 07-09-2022, 08:27 PM   #6
Senior Member
macnut's Avatar
Newmar Owners Club
Ford Super Duty Owner
Join Date: Jun 2012
Location: CA
Posts: 1,919
We keep a full tank of fresh water most of the time, as we camp almost every month. A few times a year we skip a month. To keep the water fresh and our tank in pristine condition, we add Purogene when we fill the tank. It takes an ounce for each 30 gallons. You can get it on Amazon or at
macnut is offline   Reply With Quote
Old 07-09-2022, 08:30 PM   #7
Community Administrator
NLOVNIT's Avatar

Pond Piggies Club
LA Gulf Coast Campers
Outdoors RV Owners Club
Entegra Owners Club
Skyline Owners Group
Join Date: Mar 2002
Posts: 38,134
Blog Entries: 1
Short term/during season, 2-3 gallons in both the black & grey along with additives, fresh about 1/4 tank. Long term/winter storage, empty & winterized.
Lori (& Dave, my spirit guide) - FMCA #F419886 | RV/MH Hall of Fame Lifetime Member
2016 Phoenix Cruiser 2350S & 2014 CRV EX-L AWD, My iRV2 Photo Albums
2018 Phaeton 40IH,2006 Bounder 36Z, 2004 Cougar 285EFS, 2000 Aerolite 25FBR
There is great need for a sarcasm font.
NLOVNIT is offline   Reply With Quote
Old 07-09-2022, 10:20 PM   #8
Senior Member
UFO Pilot's Avatar
Winnebago Owners Club
Workhorse Chassis Owner
Join Date: Aug 2007
Location: Sonoma County, CA
Posts: 6,167
A few gallons in the black and gray tanks. I store the MH with a full tank of fresh water and a full tank of fuel. We live in earthquake and wildfire country so we are always ready to bug out if necessary.
Wayne & Roberta and Maggie the Miracle Dog 08 Winnebago Destination 39W Gas UFO Workhorse Chassis......It's really weird being the same age as old people.
UFO Pilot is online now   Reply With Quote
Old 07-09-2022, 10:38 PM   #9
Join Date: May 2022
Posts: 33
I do similar to UFO Pilot. about 4-5 gal in the black tank, with additives, empty grey and galley tanks, pretty full fresh water tank. I do a good rinse out after each trip so tanks don't get nasty.
I live one county east of him in Solano County.
Marc - Sunny Northern California
2013 Crusader 260 RLD
2012 Ram 2500 Laramie with CTD & 4:10 gearing
mmartin_tdc is offline   Reply With Quote
Old 07-09-2022, 11:09 PM   #10
Senior Member

Join Date: Jan 2009
Posts: 4,436
I never purposely add water to the black and gray tanks after dumping. I rarely use any treatment. I have no idea whether the holding tanks dry out or not and I really don't care.
03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
Mudfrog is offline   Reply With Quote
Old 07-10-2022, 08:44 AM   #11
Senior Member
Country Road's Avatar
Join Date: May 2021
Location: Brenham, Texas
Posts: 1,528
After reading the replies and seeing what is being done, I personally conclude that there is no steadfast rule on tank maintenance. I give everyone the permission to continue to do what you’ve been doing. The tanks seem to be very resilient and can probably stand whatever is thrown at them.
Eddie and Jomaye, Retired
2018 Newmar Ventana 4369
2021 Jeep 4 dr Wrangler
Country Road is offline   Reply With Quote
Old 07-10-2022, 08:46 AM   #12
Moderator Emeritus
Gary RVRoamer's Avatar

Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 25,993
I always try and go check the level of water in the toilet to keep the seal wet, but not sure I am leaving enough water in the black and gray to keep from drying out. Any suggestions how to make sure?

A piece of Saran Wrap over the toilet bowel will greatly reduce loss by evaporation while in storage. Another trick is to trickle a couple ounces of vegetable oil into the bowel so that it floats on the surface, reducing evaporation (but it can leave a messy ring).

I wouldn't obsess about residual water in the waste tanks. Leaving a couple gallons in each is a good practice, but hardly critical. The tanks are relatively immune to evaporation anyway - the only opening is the vent pipe. Every other path has either a valve (the toilet) or a P-trap (sinks & shower).
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
Gary RVRoamer is offline   Reply With Quote
Old 07-10-2022, 11:13 AM   #13
"Formerly Diplomat Don"
Dutch Star Don's Avatar
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 21,954
We use our coach year-round. The longest it may sit is two months. Both our toilets are macerator toilets, so lots of water is used. At our last overnight stop, I dump both tanks and then whatever is used on the way home stays in the tanks until the next trip.

I've been RVing for over 45 years and in the first half of those years I obsessed with cleaning the tanks after a trip. The reality, there is no need to. Once a year I pour a bottle of grey tank cleaner in and that's it.

The freshwater tank is always kept full as we live in earthquake country. I haven't drained a freshwater tank in 30 years. I've never sanitized one in 45 years. Never ANY issues.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
Dutch Star Don is offline   Reply With Quote
Old 07-10-2022, 11:19 AM   #14
Senior Member
Join Date: Dec 2021
Location: Benicia, CA
Posts: 1,230
In 18+ years I have always drained my black and gray tanks when the trailer and motorhome are stored in California. No issues.
2022 Jayco Pinnacle 36SSWS (40 ft) / 2016 F-350 6.7L diesel crew cab long bed 4x2 DRW
2022 Thor Palazzo 33.6 diesel pusher / 2021 Chevy Equinox LT AWD toad
Camp CA 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
How much, how much, how much,is it enough? rvethereyet Going Green 38 11-22-2017 09:48 PM
What do you leave in coach when storing it? HavingABlast MH-General Discussions & Problems 17 11-01-2015 02:14 PM
The Tail lights on my KSDP leave much to be desired USMCRET Newmar Owner's Forum 5 09-22-2015 01:30 PM
Travel Trailer GVWR and axle rating don't leave much margin, is this normal? The Tiger Travel Trailer Discussion 4 03-23-2015 10:32 PM
Turn off the 110V/propane fridge when storing for a few weeks or leave on? TXRedneck RV Systems & Appliances 3 11-01-2014 12:30 PM

» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 11:38 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.