Litter-Robot by Whisker - As a rule of thumb, one cat using the Litter-Robot requires that the drawer be emptied once per week; two cats, twice per week; three cats, every other
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Amazon.com : SmartCat All Natural Clumping Corn + Wheat Cat Litter, 20 Pound (320oz - 1 Pack) - Unscented and Clay Free : Pet Supplies
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