How to Empty Grey Waste on a Motorhome – A Complete Guide


How to empty motorhome grey waste

Hey there, fellow motorhome enthusiasts! So, you’ve hit the open road and are enjoying the freedom and adventure of the motorhome lifestyle. But, as you well know, with great fun comes great responsibility – like dealing with that pesky grey waste. In this comprehensive guide, we’ll dive into the nitty-gritty of how to empty grey waste on a motorhome without breaking a sweat. Buckle up and let’s get started!

What is Motorhome Grey Waste?

Before we jump into the how-to, let’s address the elephant in the room: what exactly is grey waste, and why does it matter? Grey waste is the wastewater that accumulates in your motorhome’s grey water tank after you use the shower, sink, and other non-toilet appliances. It’s essential to empty this waste regularly to keep your motorhome’s plumbing in tip-top shape and avoid unpleasant odours.

How Often Should You Empty Your Grey Waste Tank?

The frequency of emptying your grey waste tank depends on several factors, such as the size of your tank, the number of people in your motorhome, and how much water you’re using daily. As a general guide, it’s best to empty the tank when it’s two-thirds full to avoid overflows and other issues.

How to Empty Grey Waste on a Motorhome: A Step-by-Step Guide

How you empty your grey waste will depend on the set up of your vehicle. We have a fairly new motorhome so it’s super simple for us to empty our grey waste. It’s all electronic, and all we have to do is press the ’empty waste’ button on our motorhome control panel, and that’s it! The grey waste valve opens up electronically and the grey waste empties out.

If you don’t have a set up like this, then more manual involvement may be required.

  1. Locate your motorhome’s grey waste tank.
  2. Connect the waste hose to the grey waste tank’s outlet valve.
  3. Place the other end of the hose into a designated waste disposal point.
  4. Open the grey waste tank’s outlet valve, allowing the wastewater to flow out.
  5. Close the outlet valve when the tank is empty.
  6. Disconnect the waste hose and rinse it thoroughly.
  7. Store the hose in a clean, dry location.

Voilà! With these simple steps, you’ve mastered how to empty grey waste on a motorhome.

Pro Tips for a Smoother Grey Waste Disposal Experience

  • Use a clear hose connector to monitor the waste flow and ensure the tank is empty.
  • Always have spare waste hoses on hand, just in case.
  • Consider using a grey water treatment product to reduce odours and keep your tank fresh.

Thetford 30700AK Grey Water Fresh Concentrated

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Keeps the grey water fresh and clean for longer

  • Odourless emptying of the grey water tank.
  • Excellent odour control of grey water.
  • Reduces the formation of deposits in grey water tank.
  • Dosage is based on a grey water tank capacity of 100L.

Dos and Don’ts of Grey Waste Disposal

  • DO use designated waste disposal points.
  • DON’T dump grey waste in natural bodies of water.
  • DO rinse your waste hose after use.
  • DON’T mix grey waste with black waste (from your toilet).
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Frequently Asked Questions (FAQs)

Can I use a portable grey waste tank

Yes, you can! A portable grey waste tank can be a convenient option for those who don’t have a built-in tank or need extra capacity. Simply connect the portable tank to your motorhome’s grey waste outlet, empty it as needed, and clean it thoroughly after use.

How can I reduce the amount of grey waste my motorhome produces

Water conservation is key! Take shorter showers, turn off the faucet while brushing your teeth, and wash your dishes outside of the van if you are staying on a campsite with washing up facilities.

No, it’s not. Dumping grey waste on the ground can harm the environment and is illegal in many areas. Always dispose of grey waste at designated waste disposal points.

How can I find grey waste disposal points while travelling?

There are several resources to help you locate waste disposal points, such as the Park4Night app. Additionally, many campsites offer waste disposal services, so don’t hesitate to ask the staff for assistance.

How do I maintain my motorhome’s grey waste tank and keep it odour-free?

Proper maintenance and regular cleaning can help keep your grey waste tank in good condition and odour-free. Here are some tips:

Regularly empty and clean your tank.

Use a grey water treatment product to break down waste and reduce odours.

Rinse the tank with a high-pressure hose after emptying it.

Keep your motorhome’s plumbing system in good shape by using gentle, biodegradable cleaning products.

Troubleshooting Grey Waste Tank Issues

My grey waste tank is clogged – what do I do?

If you’re dealing with a clogged grey waste tank, follow these steps:

Turn off all water sources in your motorhome.

Fill the tank halfway with hot water to help loosen the clog.

Use a tank treatment product specifically designed for unclogging.

Allow the treatment to sit for at least an hour, or as recommended by the product’s instructions.

Empty the tank as usual and monitor the flow for signs of clogging.

My grey waste tank has a bad odour – how can I eliminate it?

To tackle unpleasant odours, try the following:

Ensure that you’re emptying the tank regularly and keeping it clean.

Use a grey water treatment product to break down waste and combat odours.

Check your motorhome’s plumbing for any leaks or issues that could contribute to the smell.

Ventilate your motorhome regularly to keep the air fresh.


Emptying grey waste on a motorhome might not be the most glamorous part of van life, but it’s an essential task to keep your motorhome running smoothly and smelling fresh. With our step-by-step guide, expert tips, and troubleshooting advice, you’ll be a pro at handling your grey waste in no time. So get ready to hit the road and enjoy the freedom of motorhome living with the confidence that you’re taking care of your home on wheels like a champ! Happy travels!

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