Easy methods to Mix RV Black and Grey Water Tanks – RVBlogger

Must read

Sharing is caring!

Are you able to mix your RV black and grey water tanks? The quite simple reply is sure however extra importantly, you want to ask: why would you wish to mix black and grey water tanks? Whereas this may sound like an uncommon query, it actually isn’t that odd and you can find it’s an easy course of.

Combing your RV black and grey water tanks could make lots of distinction in your tank capability, notably for many who spend lots of time boondocking. Some RV producers are even putting in a mixed black and grey water tank in newer fashions.

I do know you’re pondering this may’t be doable. It’s. Earlier than we get into it, let’s go over just a few of the fundamentals of black and grey tanks.

What’s the Distinction Between Black Water and Grey Water?

Principally, RV black water tanks maintain the waste that comes out of your rest room. RV Grey water tanks maintain the water that comes out of your sinks and bathe requiring the next storage capability.

Black water tanks don’t want to carry as a lot and often have a smaller liquid capability. A bathroom flush doesn’t require a lot water in comparison with a bathe.

what is the difference between black water and grey water
A standard RV rest room that empties into the RVs black tank.

Why are RV Black and Grey Tanks Separated?

Black tanks can not ever be emptied into something aside from a septic system. Doing this might trigger dangerous micro organism to be on the bottom, spreading illness. Emptying your grey tank onto the bottom can lead to authorized fines or worse if you happen to’re a repeat offender.

Separating the tanks lets you retailer probably the most wastewater till you possibly can safely empty them at an RV dump station.

Easy methods to Switch RV Grey Water to the Black Water Tank

In most RVs, the grey water and black water tanks are separated however come collectively to circulation by means of the identical opening when it comes time to dump the tanks.

One thing so simple as a twist-on gate valve may be bought at Walmart, Tenting World, and different retailers which have tenting provides. This piece will permit the black and grey water tanks to be related and for the liquid to circulation between the 2 tanks.

How do You Transfer Gray Water to the Black Water Tank

As soon as the grey tank is full or has extra content material than the black, shut the gate valve, open the grey tank and let the pipe fill. Then open the black and gravity will permit the grey to equalize with the black. As soon as they equalize, shut the black and grey. You wish to be very cautious to look at the tank capability. You don’t need grey water backing up into your bathe or sinks.

Why Mix RV Black and Grey Water Tanks?

Why would you wish to do that? It is a nice thought if you happen to’ve transformed to a composting rest room. In that case, you don’t want your black tank and you need to use it to carry the overflow of the grey water tank providing you with extra grey water capability.

You don’t must dump as usually if you end up boondocking and you’ll keep out longer. You additionally don’t actually need to fret about which tank flows into which if they’re all grey water.

A composting rest room is a good eco-friendly various to a standard model. They decrease using water by mixing the waste with sawdust or peat moss and remove odor by means of an anaerobic processing system.

Cassette bathrooms are additionally a water saver. The waste goes right into a small, moveable waste tank which is eliminated when full. You may sanitarily empty them at a dump station or public restroom. These are nice for small truck campers or RVs that don’t have a black tank.

There actually aren’t any negatives to combining your tanks, I consider it’s extra a matter of selection. In the event you haven’t changed your rest room with a composting rest room or cassette rest room, otherwise you don’t boondock quite a bit, then you definitely in all probability don’t want or wish to do that.

Particularly, you don’t need a black and grey water tank overflow or your black wastewater flowing into your grey tank as a result of chances are you’ll get odors by means of the sink and bathe.

Are Grey Water Tanks Vital?

Producers are constructing RV fashions with a mixture of black and grey water tanks. This mixed tank must be massive sufficient to deal with each the black and grey water. Based on RV builders, this makes plumbing prices of producing go down.

You may take a look at these smaller fashions that have already got mixed black and grey water tanks.

Fish Home- Forest River Gray Wolf 21GP

Combined Black and Gray Water Tank in the Grey Wolf 21GP Exterior
Gray Wolf Fish Home 21GP by Forest River is an RV that mixes the grey tank and black tank.
Combined Black and Gray Water Tank in the Grey Wolf 21GP Interior
Combined Black and Gray Water Tank in the Grey Wolf 21GP Floorplan
  • Size: 32.2 ft.
  • UVW: 6,338 lbs.
  • Contemporary Tank: 15 gal
  • Fishing Holes: 8
  • CCC: 3,517 lbs.
  • GVWR: 9,855 lbs.
  • Combo Black-Grey: 23 gal
  • Sleep: 4-6

Though a comparatively small trailer at 32 toes in size, the Gray Wolf Fish Home 21GP by Forest River is one that mixes the grey tank and black tank. This mannequin is designed for ice fishermen with 8 holes built-in, in addition to a fishing rod storage system.

It includes a residential rest room and bathe with a 23-gallon holding tank, in addition to a full-size fridge and hydraulic carry system.

Truck Camper- BunduTec USA Wild

Combined Black and Gray Water Tank in the Bundutec Wild Exterior
Combined Black and Gray Water Tank in the Bundutec Wild Interior
Combined Black and Gray Water Tank in the Bundutec Wild Floorplan
  • Truck Degree: Half-Ton
  • Exterior Size: 12.67 ft.
  • Dry Weight: 1,630 lbs.
  • Contemporary Tank: 20 gal
  • Lavatory: Moist tub
    • recent cassette 4 gal
    • black cassete 5.1 gal
  • Cargo Mattress: Quick/ Commonplace
  • Flooring Size: 7 ft.
  • Heart of Gravity: 25 inches
  • Grey Tank: 11 gal
  • Photo voltaic Panel: 170w/340w (decide)
  • Battery: AGM

The Bundutec Wild truck camper additionally makes use of a cassette rest room making the mixed wastewater capability 17-gallons. It has a moist tub, which together with the holding tank, makes this truck camper distinctive. It additionally has a 20-gallon freshwater tank, compressor fridge.

You may select so as to add a 170-watt or 340-watt solar energy system and a 3,000-watt inverter. A wrap-around awning and water heater furnace are additionally out there.

Grey tanks are actually essential if you want to be self-contained. When you’ve got an eco-friendly rest room and no bathe or sink, you actually don’t want a grey water tank.

Can You Discharge Grey Water on the Floor?

Discharging grey water on the bottom violates metropolis, county, and state environmental legal guidelines. In the event you’re caught, you may be fined tons of of {dollars}. I’ve heard of some individuals doing this in a boondocking state of affairs, however I’m not suggesting you do that. Please examine the principles on the place you might be tenting earlier than you determine to do that.

There are totally different guidelines relying on the place you might be tenting. Bureau of Land Administration (BLM) company guidelines state that wash water may be drained onto the bottom. Different companies such because the U.S. Forest Service, Nationwide Park Service, Military Corp of Engineers, and U.S. Fish and Wildlife Service, don’t permit grey water to be dumped wherever besides permitted receptacles.

Most campgrounds, after all, require RVs to be self-contained, that means they have to seize all wastewater, black and grey. The mixed black and grey water tank contents should be drained in permitted dump stations or campsite drain hookups.

Though it could appear to be grey water is innocent, it doubtless comprises dangerous micro organism, mildew, and different issues. It additionally comprises substances similar to dish cleaning soap which may negatively have an effect on the setting. Dumping grey water close to a stream or underground aquifer may additionally have an effect on the standard of the water it enters.

What do I do if Black Water Spills onto the Ground
Cautious consideration if you end up emptying your black tank can hold spills from occurring.

What do I do if Black Water Spills onto the Floor?

A black water spill may cause a hazard to individuals, pets, and the setting. Ecoli can stay within the setting for as much as 70 days. Cowl the spill with backyard lime and let stand for twenty-four hours. You need to be capable to scoop up the dried substance and eliminate it correctly.

For small spills, you may also use bleach, simply be certain that to not get bleach on any pure surfaces like grass or crops. A sewage removing firm could have to be contacted to adequately get the spill cleaned.


I had by no means actually thought-about what it might imply to mix the black and grey water tanks in an RV however my analysis says it’s a fairly frequent factor to do. After I instructed my husband you could possibly truly do that, he was very skeptical.

He wished to understand how you probably did it with out dropping the tanks, drilling holes, and making a “connector” between the 2 tanks. Since he’s the one which empties the tanks, I had second ideas about what is likely to be doable. I couldn’t consider how easy the method is.

It’s my understanding that black and grey water tanks had been initially separated as a result of grey water was emptied onto the bottom. Environmentally, this isn’t a sound observe and most locations the place you camp require your RV to be self-contained. After all, meaning your entire waste is emptied into tanks.

YouTube is full of people that mixed their black and grey water tanks and have proven their viewers how they may do it too. In case you are a boondocker, this might imply an extended keep at your website with out having to go away to empty your tanks.

In some circumstances, you may almost double your tank capability. Combining the tanks is so simple as buying a twist-on waste valve which is the piece wanted to get this job carried out.

When you’ve got a cassette rest room or a composting rest room, you most actually ought to make the most of combining your black and grey water tanks because you don’t want a black water tank.

Lastly, take a look at some newer fashions that have already got the 2 tanks mixed. There aren’t many, however RV producers are beginning to mix the black and grey water tanks on smaller RV fashions to maximise wastewater capability. This can be a terrific profit to your RV wants.

Associated Studying:

RV Hookups Defined (Water, Sewer, Electrical)

Easy methods to Dump RV Tanks at Residence – Full Information with Video!

Easy methods to Clear Your RV Black Tank in 3 Easy Steps

Is It Secure To Sanitize Your RV Water Tank With Vinegar?

Why UV Water Purification Programs for RVs are Important

In regards to the Creator

Terri Nighswonger and her husband Todd are full-time RVers and work campers. They’ve been residing full-time of their RV for almost three years with their Cavalier King Charles Spaniel, Newton, and their Minnie Australian Shepherd, Remi.

They originate from the Midwest however plan to benefit from the west for just a few years, wintering in Arizona and summering wherever the highway could lead. Writing is Terri’s ardour however she additionally loves mountain climbing, kayaking, strolling her canines, and something she will be able to do outdoor.

Full Time RVer Terri Nighswonger

Sharing is caring!


- Advertisement -spot_img

More articles


Please enter your comment!
Please enter your name here

- Advertisement -spot_img

Latest article