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Grey water tank
Not just the toilet itself, but also the waste holding, grey and flush water tanks need to be treated and maintained on a regular basis. Your grey water tank is the tank that holds all wastewater except what is flushed into the toilet. Water used for showering, cooking and washing dishes ends up in the grey tank.
Grey Water Fresh Concentrated
Treat your grey water tank regularly with Grey Water Fresh Concentrated to prevent nasty grey water smells coming from the drains of your caravan or motorhome. The fluid also reduces deposit formation in the tank and keeps the grey water fresh and clean for longer.How to apply Grey Water Fresh Concentrated
Use Grey Water Fresh Concentrated every time after you’ve emptied the grey water tank. Pour directly into the sink or shower drain and flush it down with some water. Follow the instructions on the label.
Grey Water Fresh Concentrated

Duo Tank Cleaner Concentrated
Using Thetford Duo Tank Concentrated for your motorhome’s grey water tank ensures a hygienic and pleasant environment during your travels. Its powerful formula eliminates odours, and prolongs the lifespan of the grey water tank. It effectively removes limescale, encrusting and grease deposits from inside the grey water tank.
How to apply Duo Tank Cleaner Concentrated
Add 600 ML of Duo Tank Cleaner Concentrated to an empty grey water tank via the sink or shower drain, and top up with 50 L of fresh (preferably lukewarm) water. Take the motorhome for a drive, for at least one hour. Let it then rest for at least 16 hours, after which you can empty the tank, and rinse it out with fresh water. The grey water tank is now set for use or for winter storage. Adhere to the instructions on the label for the accurate dosing.Watch more
Which Thetford Toilet Care Product Do I Need?