grey holding tank
How to Maintain Your RV Grey Holding Tank
How to Maintain Your RV Grey Holding Tank
Quick Answer: To maintain your RV grey tank, use a treatment designed for grease and soap buildup, avoid putting solids down the drain, dump regularly, rinse after emptying, and monitor tank levels.
Why Grey Tank Maintenance Matters
Your RV’s grey holding tank collects water from sinks and showers. While it may seem less problematic than the black tank, grey water contains grease, soap scum, food particles, and organic residue that can create odors and clogs over time.
Routine maintenance keeps your plumbing system flowing properly and prevents unpleasant smells inside your RV.
1. Use a Grey Tank-Specific Treatment
Not all tank treatments are formulated for grey water systems. Choose a product designed specifically to break down grease and organic sludge.
Elemonate is formulated to dissolve grease, food particles, and soap buildup while helping control odors. The quick-dissolving tablet releases enzymes and leaves behind a light lemon fragrance.
How to use:
- Drop one tablet into the sink drain.
- Run water for several seconds to dissolve it.
- Allow the enzymes to work inside the tank.
2. Avoid Putting Problem Items Down the Drain
While some residue is unavoidable, limiting certain materials helps prevent buildup.
Avoid sending the following into your grey tank:
- Cooking grease or oil
- Food scraps
- Coffee grounds
- Paper towels
These materials can accumulate quickly and restrict tank flow.
3. Dump the Grey Tank Regularly
Frequent dumping helps prevent bacterial growth and odor formation.
- Regular use: Dump every 3–4 days
- Light use: Dump as needed based on tank level
When servicing both tanks, always dump the black tank first, followed by the grey tank. The grey water helps rinse residual waste from the sewer hose.
4. Rinse After Dumping
After emptying the tank, rinse it thoroughly. You can:
- Refill partially with clean water and dump again
- Use a tank cleaning wand for deeper rinsing
This helps remove lingering residue from tank walls.
5. Monitor Tank Levels
Keep an eye on your tank monitor panel. Dumping before the tank reaches full capacity prevents backups and overflow issues.
Grey Tank Maintenance Checklist
- Use a grey tank-specific enzyme treatment
- Avoid grease and solids
- Dump regularly
- Rinse after emptying
- Monitor tank levels
Bottom Line
Consistent grey tank maintenance prevents odors, protects plumbing components, and keeps your RV experience clean and comfortable.
Why Does My RV Still Smell? Common Odor Sources and Solutions
Why Does My RV Still Smell? Common Odor Sources and Solutions
Quick Answer: If odors linger in your RV even after using a black tank deodorizer, the source may be your grey tank, interior air, or hardened black tank buildup. Targeted treatments for each odor source provide complete odor control.
Odor Source #1: Grey Holding Tank
Many RV owners focus only on the black tank, but the grey tank can also produce strong odors. Grey tanks collect water from sinks and showers, which contains:
- Grease and cooking residue
- Soap scum
- Food particles
- Organic sludge
Over time, this buildup can generate unpleasant smells.
Solution: Grey Tank Enzyme Treatment
Elemonate is designed specifically for grey holding tanks. The quick-dissolving tablet contains enzymes that break down grease and sludge while releasing a fresh lemon scent.
To use:
- Drop one tablet into the sink drain.
- Run water for several seconds to dissolve.
- Allow enzymes to work inside the tank.
Odor Source #2: Interior Air (Mildew, Trash, Laundry)
RVs are compact spaces, which means odors from garbage, damp towels, or pets can quickly become noticeable.
Solution: Air Odor Neutralizer
Odor Absorber is a charcoal-infused gel that traps and neutralizes airborne odor molecules. Once opened, it works continuously for up to 60 days.
Common placement areas include:
- Under the sink
- Inside trash bins
- Near laundry storage
- In storage compartments
Odor Source #3: Black Tank Buildup (“Pyramid Plug”)
If black tank odors persist even when using deodorizer, hardened waste buildup may be the problem. This often happens when insufficient water is used, allowing solids to accumulate and cake onto tank walls and sensors.
This buildup can:
- Trap residual odor
- Cause false sensor readings
- Restrict proper tank flow
Solution: Deep Black Tank Cleaning
Commando is a concentrated enzyme cleaner designed to break down hardened solids and restore tank performance.
To use:
- Empty and rinse the tank.
- Add one packet and fill the tank with water.
- Let sit for 12–24 hours (longer if needed).
- Dump and rinse again.
The enzyme formula works without scrubbing to clean tank walls and sensors.
Complete RV Odor Control Strategy
- Treat black tank regularly
- Maintain grey tank with enzyme tablets
- Use adequate water after dumping
- Neutralize interior air odors
- Deep clean periodically
Bottom Line
If your RV still smells, the issue may not be your black tank deodorizer—it may be another overlooked odor source. Targeting each source individually ensures a fresher, more comfortable travel experience.
Need Help? Call 800-338-3155 or visit your local RV dealer for product guidance.
Will my RV holding tanks freeze?
How to prevent your RV holding tank and pipes from freezing
If you're spending the night in a cold climate—where the temperature will drop below 32 degrees—you might worry that your RV tanks and pipes will freeze. If you take a few precautions and understand the capabilities of your RV, you should be fine. Keep reading for helpful tips.
Keep your lines and valves warm.
The parts of your RV plumbing that are most vulnerable to freezing are the lines and valves rather than the holding tanks. In frigid temperatures, these can freeze and crack, causing costly repairs. In some RVs, the pipes are more exposed, while in other RVs, the propane furnace pumps heat around the tanks.
Drain the tanks and pipes and add RV antifreeze.
If the temperature drops down into the teens, you'll want to add RV antifreeze to the pipes to keep them from freezing and cracking. First, drain the tanks and lines to ensure nothing interferes with the action of the antifreeze. Then, dump a gallon of RV antifreeze down the sink and toilet drains.
RV antifreeze is very different from automotive antifreeze; the active ingredient is propylene glycol, which raises the freezing point of water. Propylene glycol is non-toxic. When temperatures rise, and you resume use of your holding tanks, you can also continue using holding tank deodorizers such as Bio-Pak or Porta-Pak.
Can I Use a Black Tank Cleaner in my Grey Holding Tank Too?
Can You Use a Black Tank Cleaner in an RV Grey Tank?
Quick Answer: Some RV owners use black tank cleaners in their grey tanks to help clean sensors, but these products are not specifically formulated for grey water buildup. For grease, food particles, and organic sludge in grey tanks, a dedicated grey tank treatment is recommended.
Is It Safe to Use Black Tank Cleaner in a Grey Tank?
Black tank cleaners are formulated primarily to break down waste and toilet paper. While they were not specifically designed for grey water systems, some RV owners report success using them to address sensor buildup inside grey tanks.
If used for this purpose, allow the solution to remain in the tank for at least 12–24 hours, or longer if needed, to help break down residue.
How Do You Apply a Black Tank Cleaner to a Grey Tank?
- Dissolve one packet in a plastic cup using room-temperature tap water.
- Stir gently until fully dissolved.
- Pour the solution down a sink drain connected to the grey tank.
- Fill the grey tank to near full capacity for best coverage.
- Allow 12–24 hours of soak time before dumping.
A fuller tank allows the treatment to contact sensors and tank walls more effectively.
What Causes Grey Tank Odors and Buildup?
- Grease from dishwashing
- Food particles
- Soap residue
- Organic sludge
- Buildup on tank walls and sensors
Unlike black tanks, grey tanks accumulate fats, oils, and soaps that require targeted formulas for optimal breakdown.
What Is the Best Treatment for RV Grey Tanks?
For regular grey tank sanitation and odor control, use a product specifically formulated for grey water systems. Elemonate is designed to break down grease, food particles, and organic sludge while freshening the tank.
Using a treatment formulated for grey tanks ensures more effective buildup removal and odor management.
When Should You Deep Clean a Grey Tank?
- Sensors are reading inaccurately
- Persistent odors are present
- Drainage seems slow
- Tank hasn’t been cleaned in months
Need Guidance? Call 800-338-3155 for expert advice on choosing the right treatment for your RV holding tanks.