Thetford toilet cassette requirements when in storage

Fill it up with water and a capful of Woolies nappy soaker. Leave it for a couple of days then empty it out.

Spray some silicon spray on the rubber seals and then put it back in place, empty.

It will be fine.

from the Thetford manual
Thoroughly clean the seals and valve blade, rub them in olive oil
and wipe them over with a cloth or a piece of toilet paper. Repeat the above operation if the seal and blade are dirty or if opening and closing the blade is getting more difficult.
Note! Never use Vaseline or any vegetable oil except olive oil. These may cause leakage.

If the toilet will not be used for a long period, it is advisable to clean
the seals and coat them lightly with olive oil. This will ensure that they
remain in good condition (supple).

Here is a tip I have learn't.
When stowing your van and it has a cassette type toilet remove the cassette and empty accordingly rinse thoroughly THEN add at least 4 ltrs of reasonably warm water (warm enough so that your hands can easily withstand the heat) then invert cassette so that the water is now covering the main valve and the vent valve and leave to soak for around 15 minutes then do the usual and rinse the cassette out again wipe over and apply Olive oil to the seals etc.
The reason to do this is that a lot of yuck can get caught up in the valve mechanism and this hopefully frees it.
I also use the pressure pack type of olive oil that we use for cooking so we have a double use for the oil.
Oh and I am a Nappisan convert also

Cheers Dodg.

Hi Gill

Ours can sit for years between uses. Either completely empty, or add a 'dose' of nappy soaker dissolved in a litre of water (as per Gone Bush's post) as this is what we usually do after emptying when on the road. A good idea to put a light silicon spray on the seal. Ours proved hard to open once when left for a couple of years or so. Contrary to Paul's advice, our Thetford booklet recommends Silicon spray, so that it what we use.

Motherhen

Glad my Jimmy's ThunderBox Doesn't hav a Cassette....

we're relatively new to this chemical stuff - do you use the napisan in place of the Thetford green stuff that goes in the tank AND the rosy rinse stuff that washes it all down????? Does the napisan replace both pink and green???.....and what quantities??

Thank you to everyone for your advice - we are using the home brand nappy product and are happy with them. We will now follow the advice re thorough rinsing and oiling the seals before the van goes into storage. We really appreciate your advice - thanks.