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I use about 8 - 12 pounds per box, times 14 litter boxes. I don't trust clumping litter because I know enough about the properties of sodium bentonite as a desiccant and about phyllosilicates in general that I wouldn't use it near cats. "Easy," isn't always best for all concerned.
You change it twice a week? That would get really expensive unless you are putting less litter in.
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