Best RV Gray Water Solutions and Portable Tanks

By Jake Morris — RV Gear Expert & Contributing Editor· June 10, 2026· 11 min read

Written by Jake Morris Senior RV Gear Writer at ShopRVGear

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Jake has spent 8 years full-timing in a Class A motorhome and has personally tested hundreds of RV products across North America. He is the lead gear reviewer at Shop RV Gear, covering solar setups, backup safety syst…

8 yrs experience·Last updated: Jun 10, 2026

Best RV Gray Water Solutions and Portable Tanks

If you're shopping for the best rv gray water solutions, you're probably trying to solve one of the most common campsite headaches: what to do when your gray tank fills up too fast. Between showers, dishwashing, and handwashing, gray water can build up quickly, especially on longer stays or at sites without full hookups. The good news is that there are several practical ways to manage it, from portable waste tanks to sewer adapters, water-saving habits, and simple campsite-friendly accessories.

In this Shop RV Gear buyer's guide, we'll break down the best options for different RV styles, camping habits, and budgets. We'll also compare top portable tanks, explain when each type of solution makes sense, and show you how to use them safely and legally.

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What Is Gray Water in an RV?

Gray water is wastewater that comes from your RV's sinks and shower. In most RVs, it does not include toilet waste, which goes into the black tank. Gray water may seem less offensive than black water, but it still contains soap, food particles, grease, toothpaste, and bacteria. That means it must be handled responsibly.

For many RV owners, gray tank capacity becomes a problem before fresh water runs out or the black tank fills. Families, full-timers, and boondockers often run into this issue first.

Types of RV Gray Water Solutions

There isn't one perfect answer for every RVer. The best setup depends on how and where you camp.

1. Portable Gray Water Tanks

These rolling tote tanks let you transfer wastewater from your RV to a dump station without moving your rig. They're ideal for:

• Campgrounds with water and electric hookups but no sewer
• Longer stays in one site
• Larger families who fill gray tanks quickly
• RVers who don't want to break camp just to dump tanks

2. Sewer Hose and Adapter Systems

Sometimes the best solution is improving how you move gray water from tank to tank or to a sewer inlet. Clear elbows, shutoff valves, wyes, and extension hoses can make dumping cleaner and more controlled.

3. Macerator Pumps

A macerator pump grinds and pumps wastewater through a smaller hose. These systems can be useful when:

• The dump inlet is uphill or far away
• You need more control over transfer
• You want cleaner hose storage than a traditional 3-inch sewer hose

4. Water-Saving Habits and Accessories

Sometimes the cheapest gray water solution is simply producing less gray water. Low-flow showerheads, dish tubs, paper plates, and navy showers can stretch your tank much longer.

Best RV Gray Water Solutions: Top Picks

Below are the best product categories and standout options for most RV owners.

1. Camco Rhino Portable Waste Holding Tank

Why it stands out

The Camco Rhino line is one of the most popular portable tank options for a reason. It offers dependable construction, practical accessories, and multiple sizes that work for everything from small travel trailers to larger fifth wheels.

Best for

RVers who want the best all-around portable gray water solution with easy availability and strong user support.

Pros

• Available in several useful sizes
• Heavy-duty construction resists leaks and wear
• Large wheels help with transport
• Includes accessories on many kits
• Easy to connect to standard RV waste outlets

Cons

• Larger models take up significant storage space
• Full tanks can be heavy if not towed carefully
• Premium over no-name options

Verdict

For most RV owners, this is the safest recommendation. If you want a proven tote tank that balances value, durability, and convenience, the Camco Rhino is the best overall pick.

2. Barker 4-Wheeler Tote Tank

Why it stands out

Barker tote tanks have built a strong reputation with experienced RVers. Their 4-wheel design and sturdy construction make them especially appealing for larger loads and repeated use.

Best for

Frequent campers who want a premium, long-lasting portable tank and don't mind paying more for durability.

Pros

• Excellent build quality
• Stable 4-wheel design
• Good capacity range for medium and large RVs
• Trusted by many long-term RV owners
• Better towing feel than some budget tanks

Cons

• More expensive than entry-level models
• Can still be awkward to store in smaller rigs
• Heavier empty weight than some alternatives

Verdict

If you camp often and expect to use a tote tank for years, Barker is a smart upgrade. It's one of the best premium rv gray water solutions available.

3. Thetford SmartTote2

Why it stands out

Thetford's SmartTote2 offers a refined design with practical features and a compact feel. It's a good fit for RVers who want easier maneuverability and a cleaner storage setup.

Best for

Weekend campers and small-to-mid-size RV owners who want a portable tank that's easier to handle.

Pros

• User-friendly design
• Smooth rolling and maneuverability
• Good hose and cap storage integration
• Trusted RV sanitation brand
• Useful for occasional to moderate use

Cons

• Not always the cheapest option
• Some users may want larger wheel setups for rougher terrain
• Capacity may still be limited for large families

Verdict

For lighter-duty use and easier handling, the SmartTote2 is a strong compact choice.

4. Flojet Portable RV Waste Pump

Why it stands out

A macerator pump isn't the first gray water solution most RVers buy, but it can be a game changer in the right setup. The Flojet system lets you pump waste through a smaller hose, which can be more convenient than dragging a heavy tote or wrestling a bulky sewer hose.

Best for

RVers who need to move gray water farther, uphill, or in situations where gravity dumping is inconvenient.

Pros

• Pumps through smaller hose sizes
• Great for difficult dump layouts
• More controlled transfer process
• Useful for home cleanout situations too
• Cleaner hose storage than standard sewer systems

Cons

• Slower than gravity-based dumping
• Requires power and more setup
• More parts to maintain
• Higher cost than basic hose solutions

Verdict

This is the best specialty option for RVers with awkward dump access or unique campsite logistics.

5. Camco RhinoFLEX Sewer Hose Kit

Why it stands out

Sometimes the issue isn't tank capacity alone. It's messy, inconvenient dumping. A quality sewer hose kit with clear fittings, secure seals, and flexible storage can make gray water management much easier.

Best for

RVers who already have enough tank capacity but want a cleaner, more reliable way to dump.

Pros

• Durable hose material
• Clear elbow helps monitor flow
• Compresses for easier storage
• Widely compatible with common RV fittings
• Good value upgrade

Cons

• Doesn't add gray water capacity
• Hoses eventually wear out with use
• Requires proper cleaning and storage

Verdict

A must-have support item. It won't replace a tote tank, but it makes any gray water setup more manageable.

6. Valterra Twist-On Waste Valve

Why it stands out

This simple accessory adds control at the dump outlet, which can prevent accidental spills and help with tank management. It's especially useful if your RV's factory valve setup is less than ideal.

Best for

RVers who want more control over dumping and fewer surprises when disconnecting hoses.

Pros

• Affordable upgrade
• Easy to install
• Helps contain unexpected waste flow
• Useful for both gray and black tank management
• Small and easy to store

Cons

• Doesn't solve capacity issues directly
• Another fitting to maintain
• Best used as part of a larger waste setup

Verdict

A low-cost accessory that improves safety and convenience. Not a full solution by itself, but a smart add-on.

Side-by-Side Comparison: Which Option Is Best?

Clear Verdict

For most RVers, a portable tote tank plus a quality sewer hose kit is the smartest combination. If you camp at partial-hookup sites, the Camco Rhino or Barker 4-Wheeler will solve the biggest problem: running out of gray tank space before it's time to leave. Add a quality hose kit and a twist-on valve, and your setup becomes much cleaner and easier to manage.

How to Choose the Right RV Gray Water Solution

Match the tank size to your RV

A portable tank that's too small will require frequent trips. One that's too large may be difficult to store or tow. As a general rule:

• Small trailers and camper vans: 10 to 18 gallons
• Mid-size travel trailers: 18 to 28 gallons
• Large travel trailers and fifth wheels: 28 to 42 gallons

Think about dump station distance

If the dump station is far from your site, a sturdier tote with better wheels matters. If you only need to move water a short distance, a smaller tank may be easier.

Consider terrain

Gravel roads, uneven campsites, and rough pavement are harder on small wheels. Larger, more rugged tote wheels are worth paying for if you camp outside paved RV resorts.

Check storage space

Portable tanks are useful only if you can carry them. Measure your pass-through storage, truck bed, or rear rack area before buying.

Know campground rules

Many parks prohibit draining gray water onto the ground. Always confirm local rules before using any disposal method.

How to Use a Portable Gray Water Tank

Using a tote tank is simple, but it helps to follow a clean process.

Materials you'll need

• Portable gray water tote tank
• RV sewer hose or transfer hose
• Gloves
• Clear elbow or fitting if desired
• Rinse hose if allowed by campground
• Tank treatment or deodorizer if needed

Numbered steps

1. Park the tote tank on level ground near your RV sewer outlet.
2. Confirm the tote valve is closed before connecting anything.
3. Attach your sewer hose from the RV gray tank outlet to the tote tank inlet.
4. Open the gray tank valve slowly and monitor the fill level carefully.
5. Close the RV valve before the tote reaches maximum capacity.
6. Disconnect the hose and secure all caps tightly.
7. Tow or roll the tote tank to the dump station according to manufacturer speed limits.
8. Connect the tote to the dump inlet and empty it fully.
9. Rinse the tote tank if a rinse station is available.
10. Sanitize fittings, store hoses separately, and wash your hands thoroughly.

Safety tips

• Never exceed the manufacturer's towing speed recommendation.
• Wear disposable gloves when handling waste equipment.
• Keep potable water hoses completely separate from waste gear.
• Avoid overfilling the tote tank.
• Use only approved dump stations for disposal.
• Rinse equipment away from drinking water sources.

Practical Tips to Reduce Gray Water Buildup

Even the best products work better when paired with smart habits.

Take navy showers

Turn the water off while soaping up, then rinse quickly. This can save gallons per shower.

Use a dish tub

Wash dishes in a small tub instead of under constantly running water. Dispose of food scraps in the trash first.

Wipe plates before washing

Less grease and food in the sink means less odor and easier tank maintenance.

Upgrade to a low-flow showerhead

A water-efficient showerhead can significantly reduce gray tank fill rate without making showers miserable.

Spread out high-water tasks

Avoid back-to-back showers and dishwashing if your tank is already near full.

Common Mistakes to Avoid

Assuming gray water is harmless

It may look less objectionable than black water, but gray water still contains contaminants and should be handled responsibly.

Buying the biggest tank without measuring

Large portable tanks are helpful, but only if you can store and move them.

Ignoring wheel quality

Cheap wheels can make a full tote tank frustrating or even unsafe to transport.

Mixing fresh-water and waste equipment

Always keep sanitation gear separate from drinking water gear.

Forgetting valve control

A simple add-on valve can prevent spills and make dumping much easier.

FAQ

1. Can I dump RV gray water on the ground?

Usually no. In many campgrounds, parks, and public lands, dumping gray water on the ground is prohibited. Always check local regulations and campground rules.

2. What size portable tank do I need for RV gray water?

That depends on your RV's gray tank size, number of campers, and how long you stay parked. Most travel trailer owners do well with 18 to 28 gallons, while larger rigs often benefit from 28 gallons or more.

3. Is a portable tote tank better than a macerator pump?

For most RVers, yes. Portable tote tanks are simpler, more affordable, and easier to use at campgrounds. A macerator pump is better for special situations like uphill pumping or long-distance transfer.

All Picks & Comparison

#		Product	Price	Rating
#1		| T-2500 | One (1) RV Fresh Water 25 Gallon Tank, Grey Water	$119.95	★★★★★ (122)	View on Amazon
#2		Camco Rhino 21-Gallon RV Portable Waste Tank - Features Large Heavy-Duty No-Flat Wheels & Low Drain Hole - Includes Removable Steel Tow Adapter, 3’ Sewer Hose & More RV Accessories (39002)	$198.00	★★★★★ (27,155)	View on Amazon
#3		"Camco Rhino 36-Gallon RV Tote Tank - Features Large Heavy-Duty No-Flat Wheels & Built-in Gate Valve - Removable Steel Tow Adapter, 3’ Sewer Hose & More RV Accessories (39006) " 36 Gallon Heavy Duty (2 Wheel) Camco	$297.65	★★★★★ (27,142)	View on Amazon
#4		Camco Rhino 28-Gallon Portable RV Tote Tank - Features 2 Steerable No-Flat Front Wheels & Built-in Gate Valve - Includes Removable 24" Tow Bar, 3' Sewer Hose & More RV Accessories (39005) Camco	$302.35	★★★★★ (2,413)	View on Amazon
#5		| T-2500-SP | One (1) Spouted 25 Gallon RV Fresh and Gray Water Holding Tank RV Concession	$119.95	★★★★★ (62)	View on Amazon