The waste pipes on a caravan are similar materials to those in a modern home, products like Mr Muscle drain cleaner are based on strong alkali (caustic) so as long as there is no aluminium in the systen there is no reason why you should not use these products. Since we bought a caravan with a decent shower and we are using CLs more, the waste keg gets filled so quick, it doesn't get chance to get smelly!!!. We used to put a small amount of toilet chemical into the waste to stop it smelling.
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