Business is Business

Posted February 25, 2021 – Narrated by Jim (updated February 2026)
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“Semper in excretia sumus solim profundum variat”
Ancient Latin saying:
Translation: “We’re always in manure, only the depth varies”

It’s time to get down to business, the business we all doo.

As a retired Chief Financial Officer, I find that recreational vehicle black water tank maintenance is better understood from a financial perspective.

black water tank maintenance

Risk Aversion is understandable and every RVer’s’ Risk Tolerance is personal. Me? I’m low risk. Why else would I be talking dollars and cents about fecal matter.

So, RVing Friends, let’s come to Terms. Our business with business deserves serious Appreciation, and it is our Fiduciary Responsibility to evaluate our Back-End Load and its Current Yield.

So take a moment to slip on a pair of gloves and draw a deep breath before we dive into the Fluid Economy of Gross Capital Flows.

I promise to guide this foray into Dark Pool Economics with the lowest possible Standard Deviation.

Call it an eMission Statement if you will, but to cover one’s Assets, it is vital that every RVer get in The Black.

Ever wonder what Investment insures that your Installment has Pass-Through Security?

Let’s flush this thing out.

What is Deposited down the toilet – from Flowing Liabilities to Gross Margins – ultimately winds up in the black water tank as a Short-term Liability.

black water tank maintenance

Our Product Development through the Channels of Distribution becomes a Receivable.

black water tank maintenance

Which in turn needs Inventory Turnover and Proper Positioning for the Moving Weighted Average to lower the Perceived Risk to an acceptable Tolerance Level.

While the Collection Period in this Safe Deposit Box is Short-Term, the Capital Input – which is Privately Owned – must be ready for its Initial Public Offering, its I Pee, Oh.

black water tank maintenance

It doesn’t matter if our black tank is a mere 10 gallons or a whopping 40 gallons, the Economies of Scale require a Withdrawal once a Benchmark is reached.

This Intensive Distribution is easier with a proper Business Plan.

So let’s get down-and-dirty with our Return On Investment and find our Break Even Point of ideas, suggestions, tips, and procedures to keep our black water tank at a high level of Liquidity and on the happy side of our Balance Sheet.

Here are the basics:

What is a Black Water Tank, (BWT)?

Everything that goes down the toilet goes into the BWT. All other drains, shower and sinks, go into the gray water tank.

Here is a Flow Chart of our sewer system

Never leave the black tank open

Leaving our BWT valve open all the time would cause the BWT to be empty of any liquids. This would cause accumulation at the bottom of the tank causing solid waste build up, blockages and odors.

Only empty the BWT when it is more than half full.

It’s the Goldilocks rule. Emptying the BWT too often is not good. Waiting too long is not good either. But ⅔ or ¾ full is just right. Waiting for that sweet spot will provide the liquid volume to swish out most of those tank solids. NOTE: When done, be sure to completely close the BWT valve and secure the sewer cap. Do not ask how I learned this.

black water tank maintenance

Empty the BWT before the gray tank

By emptying our BWT first, the soapy water from the gray tank flushes out the sewer hose (AKA: stinky-slinky) and the RV sewer outlet. This makes sewer hose storage a much more pleasant task, if that is even possible.

Always wear gloves

BWT maintenance is dirty business, so we wear disposable gloves. Some folks prefer reusable gloves, and that’s okay, but we discard the gloves after a single use.

black water tank maintenance

Only use products designed for use with a Recreational Vehicle BWT

There are countless BWT treatment products at RV supply stores, both locally and online. After almost five years of traveling full-time and emptying our BWT more than 200 times, we give Unique RV “Digest-It” Holding Tank Treatment the LIB seal of approval.

unique rv digest-it

It is 100% eco-friendly and doesn’t have that scary blue dye that causes stains. Now, with the Unique Digest-It method, our BWT tank is always odor-free.

Toilet Bowl Cleaner

We avoid toilet cleaners like Clorox, Comet, Lysol, or any anti-bacterial product containing harsh bleaches (chlorine, sodium hypochlorite, etc.) or hydrochloride acid, and hydrogen peroxide. These substances will kill off the bacteria which support an odor-free BWT.

black water tank maintenance

For cleaning the toilet, we like Unique RV Toilet Cleaner + Holding Tank Enhancer. These two dynamic bio products merge to support a pleasant BWT environment.

unique rv toilet cleaner

But toilet seat disinfection cannot be compromised, so following tank-maintenance we use a Clorox Healthcare Bleach Germicidal Wipe and dispose of the wipe in the trash bin – never down the toilet.

clorox healthcare beach germicidal wipe

The BWT needs fresh water as a base of liquid

Most bad odors and BWT blockages are caused by not having enough fresh water in the BWT after dumping. Do not ask me how I know this.

After emptying the BWT, we start fresh with enough water to make the tank-treatment chemicals work properly. With our 40 gallon BWT, we fill the toilet bowl with water, then add 2 ounces of the Unique RV “Digest-It” Holding Tank Treatment, and then flush.

Next, we squirt some Unique RV Toilet Cleaner + Holding Tank Enhancer around the bowl, fill the toilet with water, and allow for a 15 minute soak before flushing.

black water tank maintenance

Tip: Clean the toilet brush by placing it in the bowl during that 15-minute soak. Nothing like starting fresh with a sparkling clean bowl and a clean brush.

black water tank maintenance

That magic temperature – 85°

A cool environment is good for any live bacteria product. Unique RV “Digest-It” Holding Tank Treatment can only break down solids and stay effective if the temperature is right. The bio-colony in the BWT is threatened when the outdoor environment is higher than approximately 85°F. So play it cool when you’re at Burning Man. Pour some water down the toilet to lower that temperature and preserve the bacteria.

A little water in the bottom of the toilet bowl

Like pocket money, it’s insurance to always keep a little water – about an inch or two – in the bottom of the toilet bowl to create a water seal and prevent BWT odors from seeping into the cabin.

black water tank maintenance

We just – ever so slightly – press the foot lever to release a smidgen of water into the bowl without opening the toilet ball valve.

black water tank maintenance

The “X” Secret

RV toilets use very little flushing water. So, to keep things tidy we prepare by setting two 8-inch strips of toilet paper afloat over a couple of inches of water in the bottom of the toilet bowl.

This paper ‘X’ barrier before “the big number” not only helps to keep the bowl and bowl-valve clean, it also keeps the “down pipe” clean as your important business descends like a tidy toilet-paper-parachute.

“X” marks the spot – We call this our “Balance Sheets”

Special Toilet Paper?

There’s an ongoing debate in the RV world about expensive RV toilet paper versus less expensive brands. And, as usual, the answer is more complicated than YES and NO. Yes, we need a toilet paper that breaks down quickly and a RV toilet paper like Scott Rapid-Dissolving for RVs and Boats does just that. YouTube is filled with tests displaying disintegration speed results on all the major brands. Angel Soft works great for us, at a fraction of the cost of Scott RV.

black water tank maintenance
black water tank maintenance

Here’s a quick test for toilet paper disintegration: Tear off a single sheet of paper and place it in a glass of water. Allow it to soak for an hour. When the hour is up, take a look at it. Is it dissolved or is it still intact? There’s your answer.

black water tank maintenance

BWT Blocked and will not empty?

Five years ago, as newbies, our BWT refused to empty. Shortly thereafter we published the blog post, We Met The Enema, and It Is Us, which explains how we dealt with a complete BWT blockage.

black water tank maintenance

And we call BS on the myth that ice unblocks a BWT.

Here’s proof that ice down the toilet doesn’t work:

Don’t buy a cheap sewer hose

Don’t be penny-wise and pound foolish. We could have bought a sewer hose for as little $7 and as much as $115. After experimenting with several brands, we have settled on the RhinoFLEX RV Sewer Hose. Our current hose has lasted more than six years and still works great, looks good and has no leaks.

Have a sewer hose extension

We’ve encountered more than a dozen campsites where a sewer hose extension was necessary to reach the sewer connection. In those rare situations, we are grateful for our RhinoFlex 10 foot sewer extension. Sometimes, even two are necessary.

black water tank maintenance

Sewer Hose Support

While it is not technically necessary to use a sewer hose support, there are good reasons to use one.

black water tank maintenance
  • It keeps the sewer hose off the ground, making it last longer. And, it supports the hose so you don’t accidentally step on it while walking the dog in the middle of the night. Do not ask me how I know this.
  • The sewer hose support helps gravity do its job.
  • Some campgrounds require a sewer hose support, so it’s necessary equipment to have onboard.
  • While using the support, we can create a ‘water trap’ which blocks any gases or sewer flies (and worse!) from entering into our black or gray tank while the tank valve is open.
black water tank maintenance

Built-In BWT Sprayer

Some RVs come with a built-in BWT spray head. When a fresh water hose is attached, it’s supposed to flush out the inside of the tank.

black water tank maintenance

Our experience has shown that while it does clean some debris from the tank, it does a lame job. So we don’t use it. Instead, we use the Valterra Reverse RV Flush King Valve.

Warning, warning, warning!

Avoid the very common newbie mistake of confusing the city water inlet with the BWT spray head inlet. They are both threaded for a water hose. So, if you’re not careful you may think you are filling up your fresh water tank with city water but you are actually filling up your BWT. At best, this could be an embarrassing mistake, at worse it could cause toilet overflow and disastrous results in your RV. Read the label (if there is one) next to the inlets before proceeding. Again, do not ask me how I know this.

Keep the BWT Sparkling Clean (Well, kinda…)

Every time we empty our BWT, we use the Valterra Reverse RV Flush King Valve. With this cool gizmo, we refill the BWT with fresh water several times to help flush out stubborn contents and avoid a blockage.

We go into great detail and explain how we use this in our blog post: We Met The Enema, and It Was Us.

black water tank maintenance

The Valterra “Sewer Solution” Pulverizing System

While we haven’t used this product, many RVers swear by the Valterra “Sewer Solution” System.

black water tank maintenance

It pulverizes the black water tank contents and sends it down a small 1″ hose, instead of the traditional 3″ sewer hose. We only mention this as a reference. If you use it, please give us your review.

Doin’ The Stinky Slinky Crawl

When disconnecting the sewer hose from the RV, we do the ‘Stinky Slinky Crawl.’ First we carefully unhook the sewer hose from the RV, then promptly raise the end so all hose content drains down toward the dump station receiver into the sewer. This insures the hose is completely empty before disconnecting.

black water tank maintenance

The Blaster Tank Wand

The Valterra Blaster Tank Wand BWT treatment is one of those extra-mile things. Do not be deceived by this seemingly harmless, quirky-looking thingamajig because …

black water tank maintenance

… it blasts the livin’ holy blazin’ daylights out of the freakin’ BWT with high pressure water of insane velocity, producing such a disorienting racket that I feel violated when the thing is done. But, on a positive note, it dislodges any and all remnants of our former selves and sends each and every particle of whatever down the drain as if it never happened.

If you have to replace your toilet

If, for any reason, the toilet needs to be replaced, we highly recommend the Dometic 310 toilet with sprayer.

black water tank maintenance

This toilet has a perfect water distribution over the bowl when flushing, and the hand sprayer is a nifty tool to keep the bowl clean. Also, if the bowl valve starts leaking, it only takes about a minute to replace the rubber seal – no removing the toilet or any kind of disassembly is necessary.

BWT Sensor

The BWT sensor, located inside our tank, became dysfunctional years ago. Recently, we installed the Garnet SeeLevel sensor system on the outside of all the tanks. Now, we are confident the monitor is reading our tank levels accurately.

black water tank maintenance

Like finance, BWT Maintenance is a practice, a science, and an ongoing journey – an investment in a chosen lifestyle.

black water tank maintenance
Gulf Shores, Alabama – no gloves?!

As Americans we have this aversion, but modern mobile lifestyles are changing all that. So, explore. Be confident, creative and clean. Have fun with it. And most of all, don’t let the sewer hose wag the RV.

If you have an RV BWT tip or suggestion, or if you use an alternative like a compost toilet, we’d love to hear from you. Please share in the comments section below.

Products we use

We have listed all of the plumbing related products and tools we use to keep our Airstream trailer in tip-top condition.

Related Topics

Our post – Water, Water… – discusses RV water usage, conservation and filtering techniques, tips and suggestions.

Our post – Hot Stuff – discusses our solar power setup along with our lithium batteries.

Our post – We Met The Enema, and It Was Us – discusses how we solved a complete blockage of our BWT.


Special thanks to the following for their help and input on the blog post:

If you want to see the exact route we travel, click here.

*photos in this post (unless otherwise noted) were taken and copyrighted by Living In Beauty.


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71 Comments
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Jeffery Hammonds
Jeffery Hammonds
5 years ago

I spent my life and earning years in different subsets of the Humanities, therefore business terms are what I’ve heard secondhand. So as to help me be informed about things financial, is diagram under the heading of “What is a Black Water Tank” what financial people call a flow chart?

Margie Pabon
Margie Pabon
5 years ago

Wow, that was a great read and very informative….. and funny!! What a way with words!! I’m just a fly on your windshield…watching, learning and enjoying the ride!! Love you both! Safe travels!!

Debbie
Debbie
3 years ago
Reply to  Margie Pabon

Me too! 😉

Steve Jones
Steve Jones
5 years ago

The intro had us laughing hysterically! Great article Jim! One of my pet peeves is the folks at the RV park who hook up their sewer line — or lines in some cases with Y connectors, usually transparent so you can see everything — to the sewer opening, open their valves, and let ‘er rip the whole time they are there (and in the case of where we are now, than could mean several years!). As you walk through the park and pass various units you can smell what I assume are their poopalagtites and leaking sewer gas. Ugh. Ugh. Ugh. This post should be required reading for every RV’er. You could of course get a composting toilet like we did, but that is opening a totally different can of poop!

Kevin Short
Kevin Short
5 years ago

Last week we found out what happens when you fill your black tank to exactly 100% with the flush hose! It actually provided the best cleaning of the tank we’ve seen in a long time. (I wouldn’t really recommend this.)

Kevin Short
Kevin Short
5 years ago

There’s nothing like conducting your own experiment! Mary left our orange hose connected after flushing, not realizing the fresh supply valve did not close all the way. So we had a trickle of water filling the black tank for several hours. She asked me, what’s that funny sound? It was the sound of a tiny bit of water gurgling through the vacuum break device. When she flushed the toilet, it bubbled but did not overflow. I checked the gauge which read 100%. We immediately emptied to 0%. Lesson: never leave the flush hose connected, even if you think it is turned off.

Imelda & John Barlow
Imelda & John Barlow
5 years ago
Reply to  Kevin Short

Kevin and Mary, from you two, nothing would surprise me! I think no catastrophe is the best part of the experience.
All the best, Imelda and John

David Titley
5 years ago

The new gold (or black?!) standard on BWT maintenance!

Mooch Cofer
Mooch Cofer
5 years ago

I have been using the “sewer solution” one inch hose system for about 3 years. LOVE IT. One of the best things about it, being an Airstreamer, is that it will pump up hill. With the dump pipe on an Airstream being much lower than standard SOBs quite often the dump pipe at a campground is above the Airstream dump value. Thanks

Mooch. WBCCI 5433

Frank DiBona
Frank DiBona
5 years ago

I know you were thinking of me with your, “Warning, warning, warning!” about hooking up the city water to the flush out system!

Larry Cook
Larry Cook
5 years ago

Obviously, Jim, during the past 5 1/2 years of RVing, you have graduated to the ranks of us select few of Master Black Water specialists!

This title is reserved for only a chosen few of us! CONGRATULATIONS!

Larry

Ila Fay Ahearn
Ila Fay Ahearn
5 years ago

Don’t put anything down the toilet except what comes out of your body naturally. No paper or wipes or tampons EVER! ‘Nuff said.

Donna Shelton Kacmarcik
Donna Shelton Kacmarcik
5 years ago

What a great read – thank you!!

Kim Early
Kim Early
5 years ago

Great read and very informative!

Neil Henley
Neil Henley
5 years ago

I do not use chemicals. I have a tank flush and use it. I have never had any issues with oder or being plugged. If the tank is cleaned properly with a tank flush there are no problem at all. Oh and use plenty of water. Water is your friend.

Neil Henley
Neil Henley
5 years ago

A tank flush is amazing at keeping the tank clean.

digger2
digger2
4 years ago

The RV park in which we stay has it own sewage disposal system and does not allow black water treatment chemicals in the units; therefore, we do not use them even when not staying at the park. We’ve had no problems with blockage.

Allen Perry
Allen Perry
5 years ago

I would add my experience to the discussion, but I can’t stop laughing 😂

Bandit455
Bandit455
5 years ago

It is nice to see it all summed up in one place.

Summer Sky Jackson
Summer Sky Jackson
5 years ago

Good stuff!

Tony Mags
Tony Mags
5 years ago

Get ya some of this stuff. It works great. Happy Camper Organic RV Holding Tank Treatment

Taliatia
Taliatia
5 years ago

This was amazing!! very helpful information

The Cleary Clan
The Cleary Clan
5 years ago

In addition to all that you have in your blog: We are seasonal RVers. Our motorhome lives in the RV Park. We have nowhere to keep it next to our house in the city. If I need to dump while we are staying in the motorhome, I pull the dump valve, when empty I close it, then fill the toilet with water and toss in a bio-pack (breath mint), flush before it starts to dissolve or it sticks to the toilet, I then fill and flush the toilet two more times. We have a 35-gallon tank. When we are leaving the rig for a while, I dump, close the tank, pull the garden hose (also used as a fire hose) in and fill and flush the toilet ten times, empty the tank again, then do the fill, bio-pack, flush and to more fill and flushes. In almost 8 years we have had no problems with the holding tanks.
My only stinky slinky problem was the campground’s ground crew slit my hose with a weed wacker.
Bob

Michael Shelley
Michael Shelley
5 years ago

Anyone else have a Pavlovian response to reading this post? Anyway, now that I am back on the Airstream sofa…Thanks for another informative and entertaining post!

Would add one “for sure” idea and an alternative treatment suggestion:
“For sure” – Change out the plastic lid on the Dometic 310 with their Slow-Close lid; we changed ours out because we wanted a heavier lid; didn’t realize the benefits of a slow close lid. Ever made a potty run in the middle of the night and had the plastic lid slam down to awaken the DW? More importantly, the heavier (white painted wood) lid provides a comfortable seat when the lid is closed.

Suggestion: We have been using the Geo Method for black tank treatment (Calgon fabric softener in a tank of water, Dawn in a tank of water and another tank full of water; fills the BT to about 13% after treatment, but really works well. We have never experienced odor and the tank seems to flush really well.

One last thing, I too have experienced the city water/black tank rinse inlet confusion…discovered when opening the main awning…dark brown water poured along the awning and came off where you ask??? Where I was standing, of course. Labels applied immediately after that fun experience.

Thanks again for the post; really enjoyed getting together with you guys in FL. See you down the road. Michael & Judy

Mark Miller
Mark Miller
5 years ago

Great fun read as usual Jim. One suggestion. I would recommend NOT using the “water trap” in freezing weather. Creates an ice plug. Easily remedied with some hot water down the toilet, but why go through the hassle. Just take the bend out during freezing weather.

Mike and Donna Wagner
Mike and Donna Wagner
5 years ago

Your presentation of the facts of black tank management in a financial format is very entertaining. It’s all good advice too – most of us who have been RVing for years have learned those lessons too – don’t ask me how we did it – LOL. ~Donna

Mark Miller
Mark Miller
5 years ago

Jim, I met you for the first time at Chula Vista when our Orange County Airstream Club had a rally there. I didn’t know you from Adam. You were finishing some curtains as I recall. Then somehow got on to your blog and it has been a joy ever since. My eye is now trained to weed through all the ‘crap’ in the inbox and find Living In Beauty. Keep it coming forever ! Connie and I live vicariously through you three. Yes, three. You know who I’m talking about.
All the best,
Mark

Mike and Sara Hogan
Mike and Sara Hogan
5 years ago

So glad wee got the down Loo on this dark topic. Lol. Travel safe, stay awhile and happy trails.

Jennifer Sexton
Jennifer Sexton
5 years ago

Great info and even though we’ll begin our 4th year fulltiming in our Airstream next month, we learned a few things! Hubby just ordered the black tank treatment, black tank cleaner, and the toilet bowl cleaner. Thanks!

Beverly Bean
Beverly Bean
5 years ago

Your commentary was so funny!! Made us smile

Anonymous
Anonymous
5 years ago

Second dose COVID vax today and more than ready to hit the road and socialize a tad more in 10-14 days. Your post was a hilarious distraction from mild chills and general malaise. Thanks!

Allison Jacoby
Allison Jacoby
4 years ago

We all need a “golden poo parachute”. I’ll be sure to share all these tips with my BWT master. Thoroughly enjoyed your take on the dark matter. Safe travels and hoping you find your vaccinations soon.

Penny
Penny
4 years ago

We are to become first time campers!!! so excited…. I will make sure my “poop patrol” reads all the handy tips….. thanks for the info!!!

Kathy and Steve Maczko
Kathy and Steve Maczko
4 years ago

Hello from the Keys! Steve and I found your post most entertaining. I can’t tell you how many times we laughed hysterically. Very creative and excellent play on words.

We both have attempted your parachute method without much success. It looked good on paper. It’s been a struggle and maybe it’s our brand (Kirkland.) We will keep at it BUT should you refine the process, please feel free to share.

Kathy and Steve Maczko
Kathy and Steve Maczko
4 years ago

Thanks, Jim. We haven’t given up.

Terri
Terri
4 years ago

I hope this message gets through…
Okay, I empty the bwt, how much water do I fill in the tank while sitting in my drive for a week or a month?

Anonymous
Anonymous
4 years ago

Thank you for your insight. But I always thought we wanted long-term deposits.

Lincoln Green
Lincoln Green
10 months ago

OMG! This is hilarious! And so informative at the same time. I just saw this on Facebook when someone posted a link to it. Man, I have been doing some things wrong for quite some time. Thanks for the tips!


3514 days
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