How one can Unclog Your RV Black Tank

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It’s not a spot any RVer needs to be in – realizing you will need to unclog your RV black tank. Truthfully, there’s so much you are able to do to stop this from taking place, and these sources will enable you learn to keep away from clogs in your RV’s septic system: 

What Causes RV Rest room Clogs?

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Photograph by Tenting World

Clogs occur. So let’s begin with an outline of the varieties of RV rest room clogs: 

Situation #1: You left your tank valves open when linked to sewer hookups

Leaving tank valves open when linked to sewer hookups permits the liquids to empty out and leaves the solids behind, leading to a dreaded “poop pyramid” within the backside of your black tank.

Situation #2: You saved your RV with out first dumping your black tank

Now you may have compacted or hardened solids within the backside of the tank. This could occur when you depart your tank valves open, but it surely’s a extra important challenge for RVers that depart waste of their black tank when their RV is in storage. Liquids evaporate whereas solids dry out and harden.

Situation #3: You used your RV rest room improperly

Improper rest room use is the main reason behind clogs within the pipes resulting in and out of your RV black tank. By improper use, we imply utilizing an excessive amount of rest room paper, inadequate water, non-RV rest room paper, and flushing objects apart from TP and bowel actions. 

There’s no disgrace in not desirous to take care of a clogged RV septic system. Contact your native Tenting World Service Middle at this time to schedule an appointment to unclog your RV black tank. 

How one can Know Your RV Rest room is Clogged

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Photograph by Tenting World

Two foremost indicators inform you a clog is current in your RV’s septic system: 

  1. Nothing (or little or no) drains out of your black tank whenever you’re linked to sewer hookups and your black tank valve is open.
  2. You may’t clear the contents of your RV rest room bowl when flushing.  

Typically, your RV might exhibit each signs to inform you it’s time to unclog your black tank. Figuring out what precipitated an RV black tank clog might be difficult, but it surely helps to be sincere about how nicely you’ve maintained your holding tanks. 

When you opened your tank valves for per week whereas linked to sewer hookups, you’re possible coping with challenge #1. 

When you forgot to empty holding tanks earlier than winterizing your RV, you possible have a clog associated to challenge #2.

When you didn’t suppose utilizing RV-friendly rest room paper was vital, you’re most likely coping with challenge #3

How one can Unclog Your RV Black Tank

When you’re in considered one of these unlucky positions, right here’s tips on how to unclog your RV black tank and return to having fun with your RV holidays. 

How one can Unclog a “Poop Pyramid”

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Photograph by Tenting World

Begin with the primary 4 steps, however your path from there’ll differ relying in your outcomes. 

  1. Shut the black tank valve (and the valve to your grey water tank). 
  2. Pour an enzyme method RV black tank therapy down your rest room. 
  3. Depart it within the tank in response to the producer’s suggestion (normally just a few hours and as much as a number of days). 
  4. Join your sewer hose to a hookup and open the black tank valve. 

If waste flows out usually, shut your sewer tank valve and fill the tank with water and extra waste digester to additional break down solids. Depart for the really helpful period earlier than emptying the black tank. 

If waste doesn’t circulate, you’ll have to unclog your tank manually. This requires snaking your tank with a versatile RV tank wand. The most effective of those wands hook as much as a freshwater supply to have the identical impact as an RV geared up with a black tank flush. 

To verify that you just’ve eliminated a clog, you’ll have to have your sewer hose linked and open your black tank valve. When waste flows out, add water to your black tank to flush it as totally as attainable. Repeat till clear water flows via your clear 90-degree elbow connector.

How one can Take away Compacted Solids out of your RV Black Tank

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Photograph by Tenting World

When you didn’t retailer your RV accurately after winterizing it, you’ll must take care of a block of solids, not only a pyramid. Use these steps to take away compacted solids out of your RV black tank: 

  1. Fill your black tank with contemporary water and add an enzyme-digesting black tank therapy. 
  2. Let it sit within the tank so long as the therapy producer recommends (normally a minimum of in a single day). 
  3. Take your RV to a dump station, join your sewer hose, and take a look at emptying the black tank. 

If no waste flows out of your tank, shut the valve and let the therapy sit for longer – one other 24 hours gained’t harm. Repeat the method of making an attempt to dump your tank. 

When the contents start to empty out of your tank, flush it utterly. Then, fill the tank with contemporary water once more and drain till you now not see bits of solids exiting your clear elbow connector. 

How one can Clear Pipe Clogs in your RV

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Photograph by Tenting World

Unclogging a tank that has an excessive amount of rest room paper or inadequate water is a simple repair. Issues can be harder when you flushed different hygiene merchandise or didn’t use RV-friendly rest room paper

If nothing is draining out of your tank whenever you open the valve after leaving your valves closed, you’re most likely coping with a clog. 

Right here’s your path to clearing clogged RV septic plumbing: 

  1. Use a plunger to attempt to take away the clog. It could solely push out the blockage partially, however it will possibly scale back the backup. 
  2. Strive pouring an enzyme answer down the bathroom and letting it sit for the really helpful period. After the time has elapsed, strive flushing to see if the answer has eaten away on the clog. 
  3. If it doesn’t flush, strive plunging the bathroom once more. Chances are you’ll want so as to add extra tank therapy answer and wait longer. 

If that doesn’t take away the clog, use a versatile PEX pipe or your tank wand to push down via the clog and into the black tank. If you do clear the clog, fill your tank with contemporary water and drain it utterly to take away the clogged contents. 

FAQs About RV Black Tanks

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Photograph by Tenting World

To additional enable you forestall a clogged RV black tank, right here’s extra information that can assist you perceive tips on how to deal with your RV septic water system proper. 

How lengthy can black water keep in an RV holding tank?

Your greatest answer – when your tank indicator LED hits two-thirds, empty it. We don’t suggest letting a full RV holding tank sit for greater than per week with out emptying it, as this can considerably improve the potential of odors and clogs. 

Skilled Tip: Keep away from driving lengthy distances with a full RV holding tank, because the bumps and vibrations may cause full and heavy black tanks to drop out of the underside of your RV. 

What’s the greatest RV black tank therapy?

In terms of RV holding tank remedies, Thetford, Camco, Walex, and Pure Energy (from Valterra) are a number of the main manufacturers for odor elimination and waste digestion. Most of their merchandise are designed for secure use in all RV septic techniques however verify the instructions and labels earlier than utilizing them in your RV. 

Store Tenting World’s choice of sewer chemical compounds.

Can you set bleach in an RV black water tank?

Keep away from utilizing bleach when eradicating clogs from RV black tanks. Caustic chemical compounds can harm the seals, valves, and plumbing traces, resulting in extra in depth (and costly) repairs. RV tank remedies are your greatest buddy when you have to break down waste and unclog RV black tanks.


If you’ve handled a clogged black tank as an RV proprietor, you’ll understand it’s a lot simpler to keep away from a clog than to repair one. Hopefully, the following tips will enable you get rid of your clog and get again to all the enjoyable components of RV residing

Do you may have further questions on unclogging an RV black tank? Tell us within the feedback beneath.



Tucker Ballister is our Technical Content material Author. He’s a lover of the open street and the proud proprietor of a 2021 Sunlite Basic journey trailer (his third RV so far). Take a look at extra of his RV adventures, gear evaluations, and outside recommendation at thebackpackguide.com.



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