There are two types of water tanks: above ground and below ground. Above ground water tanks are the most common type of tank. They are usually made of plastic or metal and can be purchased at most home improvement stores.
Below ground water tanks are less common but are often used in areas where space is limited, such as in a crawl space. These tanks are made of concrete, fiberglass, or plastic and can be difficult to install.
The size of the water tank you need depends on the size of your home and the number of people living in it. A small home with one or two people may only need a 50-gallon tank, while a larger home with four or more people may need a 500-gallon tank.
If you live in an area with frequent power outages, you may want to consider purchasing a backup generator that can be used to pump water from your tank in case of an emergency.
Why External Grey Water Tank Is Necessary?
There are a number of reasons why having an external grey water tank is necessary. Perhaps the most obvious reason is that it allows for the collection and reuse of grey water, which would otherwise be wasted. This can be extremely important in areas where water resources are limited, or in times of drought.
Another reason why an external grey water tank is beneficial is that it can help to reduce the amount of sewage discharge from a property. In many cases, sewage and effluent contain harmful bacteria and viruses that can pollute groundwater if they are allowed to seep into the ground. By collecting and storing grey water in an external tank, it can be used to flush toilets and irrigate gardens, thus reducing the amount of pollution that enters the environment.
Finally, having an external grey water tank also provides a convenient way to store rainwater runoff from roofs during wet weather conditions. This stored rainwater can then be used for watering plants or cleaning outdoor surfaces during dry spells – helping to save on precious resources such as tap water.
Our Top Picks For Best External Grey Water Tank
Best External Grey Water Tank Guidance
Grey Water Odor Control – RV Grey Water Tank Treatment, 24 oz – Thetford 15842

No one likes to be surprised by an unpleasant odor, least of all when you’re on vacation. The last thing you want to do is open up your RV’s grey water tank and be met with a foul smell. That’s where Thetford’s Grey Water Odor Control comes in. This versatile product is designed to eliminate odors in RV grey water holding tanks, showers, drains, vents, and traps of sinks. It dissolves cooking grease and cleaning residues, and prevents grease build-up in grey water holding tanks, eliminating the source of offensive odors. Grey Water Odor Control is a 100% biodegradable liquid acting as a deodorant and detergent. Non-staining, 100 percent biodegradable formula. Eliminates grey water odors in RV drains and vents; No chlorine or solvents to damage valve seals. Prevents and removes grease build-up. Pleasant floral scent. Easy to manage 24 ounce bottle.
Common Questions on Grey Water Odor Control – RV Grey Water Tank Treatment, 24 oz – Thetford 15842
• What is the best odor control method for a RV grey water tank?The best odor control method for a RV grey water tank is to use a Thetford 15842 odor control treatment. This treatment will help to keep odors under control and make your RV more enjoyable to use.
• How often should I treat my RV grey water tank with Thetford 15842?
You should treat your RV grey water tank with Thetford 15842 at least once every three months. This will help to keep the tank clean and free of any odors that might build up over time.
• What are some of the other benefits of using Thetford 15842 on my RV grey water tank?
In addition to odor control, Thetford 15842 also helps to keep your grey water tank clean. This will help to extend the life of your tank and keep your RV running smoothly.
Why We Like This
• Eliminates odors in RV grey water holding tanks, showers, drains, vents, and traps of sinks• Dissolves cooking grease and cleaning residues• Prevents grease build up in grey water holding tank, eliminating the source of offensive odors• Formulated without chlorine or solvents to damage valve seals• 100% biodegradable liquid acting as a deodorant and detergent
Additional Product Information
Height | 2.5 Inches |
Length | 8.5 Inches |
Weight | 1.69 Pounds |
Camco Rhino Portable RV Tote Tank | Transport Waste from Camper or Trailer | Features Large, Heavy-Duty, No Flat Wheels and a Low Drain Hole | 21 Gallon (39002)

If you’ve ever been RVing, you know that one of the least pleasant tasks is dealing with waste. But the Camco Rhino Portable RV Tote Tank makes it easy to transport waste from your RV or trailer to a dump station. The tote tank is made of extremely durable blow-molded HDPE that won’t leak or deteriorate in the sun. It features large, no-flat wheels for smooth transport and a removable steel tow adapter that allows you to roll it like a suitcase or tow it behind a truck or golf cart. The integrated ladder hook sturdily clamps onto an RV/camper ladder when not in use. The low drain hole ensures that the tote tank empties completely and the smooth interior is easy to wash off using the integrated tank rinser. The tote tank measures 20 ½-inches (L) x 13-inches (W) x 40-inches (H) and has a minimum waste height hook up of 13-inches. It weighs 34 ½ lb. Made in the USA. Patented.
Common Questions on Camco Rhino Portable RV Tote Tank | Transport Waste from Camper or Trailer | Features Large, Heavy-Duty, No Flat Wheels and a Low Drain Hole | 21 Gallon (39002)
• How many gallons can the Camco Rhino RV Tote Tank hold?The Camco Rhino RV Tote Tank can hold 21 gallons.
• What are the dimensions of the Camco Rhino RV Tote Tank?
The Camco Rhino RV Tote Tank is 39.5″ L x 20.75″ W x 14.5″ H.
• What are the features of the Camco Rhino RV Tote Tank?
The Camco Rhino RV Tote Tank features large, heavy-duty, no flat wheels and a low drain hole.
Why We Like This
• Transports waste from your RV or trailer to a dump station• Includes: (1) tote tank, (1) handle, (2) wheels, (1) tank rinser, (1) ladder hook, (1) 3’ sewer hose w/ swivel fittings, (1) 15” female to female Rhino grey water hose, (1) clear elbow w/ 4 in 1 adapter, (1) clear double bayonet elbow, (3) storage caps, (2) caps w/ lanyards, & (1) steel tow adapter• Easy to transport: Large, no flat wheels make transport smooth and effortless• Simple to clean: The low drain hole ensures that the tote tank empties completely• Durable construction: Constructed of extremely durable blow molded HDPE that won’t leak or deteriorate in the sun
Additional Product Information
Color | Gray |
Height | 40 Inches |
Length | 20.5 Inches |
Weight | 34.5 Pounds |
Barker 10893 Tote Tank – 10 Gallon Capacity , Blue

Assuming you would like an in-depth product description of the Barker 10893 Tote Tank:
This tote tank is a blow-molded polyethylene construction that can hold up to 10 gallons. It is equipped with heavy-duty wheels and standard bayonet fittings for your convenience. The tote tank also comes with a Blue finish.
Common Questions on Barker 10893 Tote Tank – 10 Gallon Capacity , Blue
• What is the total capacity of the tank?The tank has a capacity of 10 gallons.
• What is the dimensions of the tank?
The tank is 18.5″ X 16.5″ X 13.5″.
• Is the tank BPA free?
Yes, the tank is BPA free.
• What is the weight of the tank?
The tank weighs 5.1 lbs.
• Can the tank be used with an air compressor?
Yes, the tank can be used with an air compressor.
Why We Like This
• 1. Perfect for storing and transporting water for household or outdoor use• 2. 10 gallon capacity• 3. Quality construction with blow molded polyethylene and zinc plated steel brackets• 4. Large, heavy duty wheels for easy maneuverability• 5. Standard bayonet fittings for easy connection to hoses and accessories
Additional Product Information
Color | Blue |
Height | 8.75 Inches |
Length | 30 Inches |
Weight | 9.24 Pounds |
A.A 21 Gallon RV Fresh/Gray Water Tank 39″ x 16″ x 8″ – BPA Free (21 Gallon)

Assuming you would like an expanded blog section on the 21 Gallon RV Fresh/Gray Water Tank:
When it comes to RVs, one of the most important features is the fresh water tank. This is especially true if you plan on spending any significant amount of time on the road. After all, you need to have a way to store all of your fresh water so that you can use it for cooking, cleaning, and drinking.
The 21 Gallon RV Fresh/Gray Water Tank is a great option for anyone in need of a reliable and durable fresh water tank. This tank is made from high quality polyethylene, meaning it is built to last. The seamless design also means that there are no seams that could potentially burst.
In addition, this tank features stain, corrosion, and rust resistant features. This makes it the perfect choice for replacement or OEM installation on RVs, horse trailers, or marine products. The tank must be vented in order to function properly, but other than that, it is easy to install and use.
If you are looking for a high-quality fresh water tank for your RV, the 21 Gallon RV Fresh/Gray Water Tank is a great option to consider.
Common Questions on A.A 21 Gallon RV Fresh/Gray Water Tank 39″ x 16″ x 8″ – BPA Free (21 Gallon)
• What are the dimensions of the A.A 21 Gallon RV Fresh/Gray Water Tank?The A.A 21 Gallon RV Fresh/Gray Water Tank has dimensions of 39″ x 16″ x 8″.
• What is the capacity of the A.A 21 Gallon RV Fresh/Gray Water Tank?
The A.A 21 Gallon RV Fresh/Gray Water Tank has a capacity of 21 gallons.
• What is the function of the A.A 21 Gallon RV Fresh/Gray Water Tank?
The A.A 21 Gallon RV Fresh/Gray Water Tank is used to store fresh and gray water in an RV.
• What is the material of the A.A 21 Gallon RV Fresh/Gray Water Tank?
The A.A 21 Gallon RV Fresh/Gray Water Tank is made of BPA-free plastic.
• How do I clean the A.A 21 Gallon RV Fresh/Gray Water Tank?
To clean the A.A 21 Gallon RV Fresh/Gray Water Tank, simply rinse it out with clean water.
Why We Like This
• 21 gallon capacity• Rotational molded for durability• Seamless construction• Rust and corrosion resistant• Vented design
Additional Product Information
Height | 8 Inches |
Length | 39 Inches |
Valterra T21302VP Horst Miracle Probe – Gray Water Tanks, Pack of 4

Valterra’s T21302VP Horst Miracle Probe is a great way to easily and efficiently add gray water tanks to your existing system. These probes are designed to fit in the 3/8″ diameter holes of existing probes, and are compatible with existing wiring and monitors. Additionally, they are easy to install and require no special tools or expertise. Simply insert the probe into the desired hole, tighten the set screw, and you’re ready to go!
Common Questions on Valterra T21302VP Horst Miracle Probe – Gray Water Tanks, Pack of 4
• What is the best way to clean a Horst Miracle Probe – Gray Water Tanks?The best way to clean a Horst Miracle Probe – Gray Water Tank is to use a mild soap and water solution. Repeat this process five times with unique values.
• What is the best way to remove sediment from a Horst Miracle Probe – Gray Water Tanks?
The best way to remove sediment from a Horst Miracle Probe – Gray Water Tank is to use a Sediment Removal Kit.
• How often should I clean my Horst Miracle Probe – Gray Water Tanks?
It isrecommended that you clean your Horst Miracle Probe – Gray Water Tanks every three months.
Why We Like This
• 1. Easy to install• 2. Fits the 3/8″ diameter holes of existing probes• 3. Compatibility with existing wiring and monitors• 4. For use with gray water tanks• 5. Easy to clean
Additional Product Information
Height | 1.5 Inches |
Length | 7.5 Inches |
Weight | 0.0440924524 Pounds |
Benefits of External Grey Water Tank
It’s no secret that Grey water tanks can save you a lot of money on your water bill. But did you know that they can also help reduce the amount of stormwater runoff?
When it rains, the stormwater runs off of your roof and into the street. This water is not treated before it enters our waterways, so it can pick up pollutants like nitrogen and phosphorus. These nutrients contribute to algae blooms, which are harmful to our aquatic ecosystems.
Grey water tanks collect this stormwater runoff and allow it to slowly seep back into the ground, where plants can use it.
Buying Guide for Best External Grey Water Tank
When you are thinking about an external grey water tank, there are a few things that you need to take into account. The size of the tank, the type of material it is made out of, how easy it is to clean and maintain, and where it will be placed. All these factors will affect your decision on what is the best external grey water tank for you.
The size of the tank should be based on the amount of grey water that your home produces. If you have a small home or live in an apartment, then a smaller tank might suffice. However, if you have a larger home or produce more grey water, then you’ll need a larger tank. It’s important to get one that’s big enough to store all the grey water your home produces so that you don’t have to empty it frequently.
The type of material an external grey water tank is made out of will also play a role in your decision. Some materials are better at resisting corrosion and won’t break down as quickly. Others might be cheaper but won’t last as long. You’ll need to decide what material is best for your needs based on how much money you want to spend and how long you want the tank to last.
One final factor to consider when choosing an external grey water tank is ease of cleaning and maintenance. Some tanks require more work than others to keep them clean and running properly. If you don’t want to spend a lot of time on maintenance, then look for a model that’s easy to clean and doesn’t require much upkeep.
Frequently Asked Question
What are the best external grey water tanks?
Some factors you may want to consider when choosing the best external grey water tank for your needs include the size of the tank, the materials it is made from, and the price. You may also want to check reviews to see what others have to say about the different brands and models of grey water tanks.
What are the benefits to an external grey water tank?
The benefits to an external grey water tank are that it is less likely to freeze in cold weather, it is less likely to overheat in warm weather, and it is easier to clean.
What are the best features of an external grey water tank?
Some of the best features of an external grey water tank include: -Ease of installation: External grey water tanks can be installed relatively easily, often with little to no professional help required. -Cost savings: External grey water tanks can save you money on your water bill each month, as they allow you to recycle and reuse water that would otherwise go down the drain. -Water conservation: In addition to saving you money, external grey water tanks also help to conserve water overall, as they reduce the amount of water that needs to be treated and/or disposed of. -Space-saving: External grey water tanks can free up space inside your home, as they are typically installed outside. -Aesthetics: Depending on the type and style of external grey water tank you choose, it can also enhance the look of your home.
How easy is it to install an external grey water tank?
The answer may vary depending on the type of external grey water tank being installed. Generally, however, it is not difficult to install an external grey water tank.
What are the best ways to use an external grey water tank?
There are a few different ways that you can use a grey water tank. One way is to use it as a way to water your plants. You can also use it to wash your car or to wash your pets.
Conclusion
Thank you for your time, it was great speaking with you about our new external grey water tank. I believe this product is the best on the market and would be perfect for your home. After seeing the benefits and how easy it is to install, I hope you agree that this product is the right choice for you.
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