Kitty Litter, and Oil Dry are a clay product. I've never notice it to swell. Diamatex is also a clay product that is used for infields, and is a suitable material if screened, but it is a yellowish tan, so it would need to be colored. I use fine crushed gray stone from a building supply house. It's known by different names: Moon Dust, Screenings and concrete sand. I sift it through a window screen. I don't remove the fines like some do.
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