I've never used it but prehaps you could try that rock system. It
seems to be small pebbles/rock which are placed in the litterbox and
the whole attraction is that there is no smell because the urine can
easily evaporate, solids can be easily lifted out and you only change
the stone every few (5?) months, simply wash them off every month I
think is what the box said. It seemed interesting but our girls are so
picky the ONLY thing they'll use is Johnny Cat so I don't think I'll
try it.
Good luck and let us know what you decide to use (and if it works)
LisaBeth
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--life is too short not to fingerpaint--