Thread Tools Display Modes
Old 07-29-2015, 11:59 AM   #11
Junior Member
Join Date: Jul 2015
Posts: 5
I second the notion of never leaving the tank completely empty.

Wolverine is offline   Reply With Quote
Old 07-29-2015, 12:07 PM   #12
Senior Member
Join Date: Dec 2014
Posts: 229
After empting the black tan, I ad 2 toilet fulls of water plus an enzyme / bacteria type chemical like Kronen. Kronen doesn't have the strong formaldehyde smell and it helps keep the probes and tank clean and also lubes the seals.

tomrob1161 is offline   Reply With Quote
Old 07-29-2015, 03:28 PM   #13
Junior Member
Join Date: Jan 2014
Posts: 8
During camping season, leave a couple gallons of water in tank with a dose of tank chemicals. That will keep it from stinking. For last dump of season, I give it an extra good wash out and then leave the valves open when I winterize to get excess water out. Last step is to close the valves and winterize the traps with a bit extra so I know there is a little antifreeze in the tank just for safety against the valves. I have also heard to leave the tank valves open and put a piece of fine mesh screen over the dump outlet to both dry the tank and keep pests out of it.
Reason201 is offline   Reply With Quote
Old 07-29-2015, 04:20 PM   #14
Senior Member
Join Date: Dec 2014
Location: oakdale, ca
Posts: 289
If you do a complete flush every time you are done with it the unit you should be ok. You will always leave a small amount of water in the tank because it is almost imposable to remove all of it. This would be enough water to keep seals moist. The chemicals are not needed while storing they will only last a limited time period and then do no good. They are primarily for deodorizing and breakdown of raw sewage and do no good by alone. Also some of them state not to do this practice.
j free is offline   Reply With Quote
Old 07-29-2015, 05:43 PM   #15
Senior Member
Join Date: Dec 2014
Posts: 229
In the past, as reason201 said, I left my tanks open with a piece of plastic window screen over the open pipe to keep insects out. However, I was afraid the seals would dry out so, I started closing the valves again, with the little bit of RV antifreeze that was there from winterizing the system. However, when I read my owners manual on my 2013 Rockwood Signature Ultra Lite, 8315 BSS, it recommended adding a gallon of RV Antifreeze to each holding tank. Although our winters are real bad in Alabama, I felt this was a good recommendation to follow. I've got 3 holding tanks, so it takes an extra 3 gallons of RV antifreeze, but if you catch it on sale, the cost is minimal.
tomrob1161 is offline   Reply With Quote
Old 07-29-2015, 05:50 PM   #16
Senior Member
markb5900's Avatar
Join Date: May 2013
Location: Missouri
Posts: 327
I have had three motor homes, a pop up, a pull behind TT and a 5th wheel.
During the camping "season". I drain my tank when I get home at the local city park that has a dump station and that is it.
There is always a small amount left in the tank as stated above.
Since 1987 I have NEVER had a problem with seals drying out doing this method and never added chemicals while it was sitting in the drive way.
Now as a note, we do take it out at least twice a month so it doesn't sit long in the summer.
When I winterize, I do a REALLY REALLY REALLY good flush on it to make sure it is clean before putting it away for the winter.
Mark B
2015 32 Foot Rockwood 8289WS 5th Wheel
2013 Chevy 3/4 Ton TV
markb5900 is offline   Reply With Quote
Old 07-30-2015, 10:51 AM   #17
Senior Member
Join Date: May 2012
Posts: 356
A friend drained the black tank then left it dry while not using the trailer for a few months. The remaining gunk in the tank settled at/near the valve then hardened, totally blocking the drain. This was, of course, discovered when the black tank was almost full and couldn't be dumped.

An RV tech came out and was able to flush out the drain from the drain hose end, using a 6' long wand. I wasn't there when the clog came loose but I imaging that it was a sh***y experience. I'm glad it was the tech and not my friend doing this.

Moral - always keep liquid in the tanks. Use water in the summer and antifreeze in the winter.

pmsherman is offline   Reply With Quote
Old 07-30-2015, 11:11 AM   #18
Senior Member
Jim34RL's Avatar
Join Date: Feb 2015
Location: Oswego il
Posts: 785
When we bought our first 5er way back when; I was taught by a very small dealer on what to do. The dealer provided 5 hours of instructions plus driving lessons. This included backing up the 5er since this was our first unit.

In the instructions for dumping the black tank and all the other tanks, was to leave them dry with no water in them when in storage. His reasoning was the water will evaporate over time and you where just wasting the water. He also stated that this will also lead to odors in the camper from the tanks as the water evaporates. He did state to flush them good and use the black tank flush port along with dumping several buckets of water down the toilet when flushing the system as you break camp. The tanks will be cleaned and debris will not pile up in the tanks.

I have done this ever since we purchase our first fiver and have had no issues with the tanks or the tank gage lights as they stay clean.
Jim W.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67
Jim34RL is offline   Reply With Quote
Old 07-30-2015, 11:13 AM   #19
Senior Member
Join Date: Dec 2014
Posts: 131
I'm with j free and markb9500. I just drain the tank and rinse the tank by filling the bowl a coupe of times and flushing the toilet ( or however you prefer), let the sewer hose run until it's not dripping and then shut the gate valve. Never had a problem. No chemicals used. Non-freezing climate, I should note.
ActionJackson is offline   Reply With Quote
Old 07-31-2015, 04:01 AM   #20
Senior Member
Join Date: Apr 2015
Location: Oregon
Posts: 111
Its great having so much feedback on this topic, thank you everyone! It sounds like I could probably go either way and be safe...The most important thing being that I thoroughly clean out the blank tank after use.

2014 Ford F-150
2015 Apex Nano 193BHS
2016 Nights Camped: 13
mbCik is offline   Reply With Quote

black, black water, storage, tank, water, water tank

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

» Virginia Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 03:16 PM.