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:

1. Drop one tablet into the sink drain.
2. Run water for several seconds to dissolve it.
3. 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.