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Vocanic rock found-often in the garden sections; hung in a fish net bag will absorb lots of oders from pets litter boxes. Non ceramic coated of course and plain colored lite colored works best. Put it in a hidden place and when it doesn't seem to be working as well simply put out in the sun for a day or two. It will then work great again! Hepa aircleaners with ionic options also work good for both humans and pets; esp in an apt where air quality isn't as large to begin with !