... free [Use]1. Fill litter box with silica gel cat litter to the lever of 1.5 inches.2. ... .3. For more than one cat, you can reduce the period of replacing cat litter in proportion, rather than ... way to use one 1.8kg bag is following: one cat, one month, two Cats, about 15 days, three cats ... 5. Store Cat litter box or silica gel cat litter in clean, non-moisture places, to extend its service life.Choose Me ...