The CatGenie Washable Granules will never need replacement but it is very important add additional granules when the extent of the granules fall below the road at the bowl. On average it is very important add a couple of cups a month and a box of granules must last between 2 to 5 months depending at the collection of cats that use the CatGenie. The CatGenie Washable Granules are Septic Protected.
To be used with CatGenie Self-Washing Cat Box
Dust-free, non-toxic natural and artificial materials
Use to replenish cat box when level runs low
Box lasts 2 to 5 months