Yep, as Gary Kelly says, Woolies home brand clothes and nappy soaker. One capful after empty, then as needed, every second day or so - use only 2 ply loo paper, breaks down much better, some people don't even put it in the loo,, they use a plastic bag. No need to add water to the cassette, other liquid (pee) does the activation. As for the flush, no need for anything other than water. A half cap of eaucalyptus oil in the cassette keep it smelling nice, as does wiping the loo seat etc with eaucy!