I use grass seed litter is it safe to use in the robot? : r/litterrobot
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Amazon.com : SmartCat All Natural Clumping Cat Litter, 10 Pound (160oz 1 Pack) - Alternative to Clay and Pellet Litter - Chemical and 99% Dust Free - Unscented and Lightweight : Pet Supplies
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Pros And Cons Of Grass Cat Litter - Plus Top Brands - Eco Cat Litter