Thetford Grey Water Fresh Concentrated is a highly effective fluid designed to keep your grey water tank (sink and shower waste tank) hygienic and free from unpleasant smells. The concentrated 800ml bottle provides long-lasting treatment and prevents grease build-up, ensuring your waste water tank and pipes stay clean and fresh.

Part Number: 30700ZK

Bottle Size: 800ml concentrated liquid

Dosage: Approx. 50ml per 50 litres of grey water tank capacity

Use: For sink and shower grey water tanks

Key Features:

• Specially formulated for grey water tanks (not toilet waste tanks)

• Prevents nasty odours from sink and shower water

• Reduces grease and deposit build-up inside tanks and pipes

• Concentrated formula 

• Safe for plastic tanks and seals

• Easy to dose and pour

• Eco-conscious formula for safe use in caravans and motorhomes

Frequently Asked Questions 

Q: What is grey water?
Grey water is the waste water from sinks, showers, and washing in your caravan or motorhome. It is different from toilet (black water) waste.

Q: Can I use this in my toilet cassette?
No , this product is not for toilet waste tanks.

Q: How much do I need to use?
Use approximately 50ml per 50 litres of tank capacity. Add directly to the grey water tank via the sink or shower drain.

Q: Will this stop bad smells coming from my drains?
Yes ,  it prevents odours caused by bacteria and grease in grey water tanks and pipes.

Q: How long will a bottle last?
One 800ml bottle provides around 16 treatments for a 50L tank, depending on usage and dosage.