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The Thetford cassette loo with the funnel just above the cassette is known as the C4 model and the toilet itself is much like a bench type and the one that you are referring to is the C200 and the toilet is more like the one you have at home which swivels on the base. The little exterior door just above the cassette door is indeed the access to the top up tank. The first link is the C4 type and the second link the C200 type.

http://www.leisureshopdirect.com/caravan/water/thetford_cassette_toilets/Thetford_C2__Thetford_C3_and_Thetford_C4_Cassette_Toilets_-_Spare_Parts.aspx

http://www.leisureshopdirect.com/caravan/water/product_28618/Thetford_C200CW_Cassette_Toilet.aspx?aff=122

Just a thought,  but myself and others have given up putting the pink in, as while its in storage it can congeal in those difficult  to  clean areas and can make the flusher stick..

Cost me a call out fee + an hourly rate to find that out. Was not best pleased!

Just a thought, but myself and others have given up putting the pink in, as while its in storage it can congeal in those difficult to clean areas and can make the flusher stick.

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You can purchase a tank cleaner manufactured by Thetford for cleaning the flush tank out but always remember to drain all the fluid out if left in storage during winter as it can freeze and damage vital parts within the holding tank etc.

 At this time of year best to only fill it with enough for present use and empty at end of each trip.  You don't want it freezing up.

As a matter of interest only, we travel with all the water holders, e.g. heater and flush  empty.  For both stability and less weight.

Hi, I now use the Elsan pink in the flush water.

I have tried using a small amount of the thetford pink but still got the black bits, since the change to Elsan pink no more black bits, no matter what concentrate of pink I use, I fill flush tank with the shower hose, I have the C4 with the swing out filler.

birder99, like the idea of draining the unused flush water, seamed a waste just to flush it down drain unused.