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Two four litre bags of pumice (aka lava) stones ideal for use in XL, Jumbo and Super Jumbo chimineas.
Empty the pumice stones into the base of your chiminea, up to a couple of centimetres below the lip of the mouth and you are done.
Pumice, as well as being lightweight, is an excellent insulator and will protect the clay from thermal shock.
No need to replace or buy more – they’ll last for the lifetime of your chiminea.