Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
In some areas of N.A. depending on where it's quarried & shipped, PFS can be obtained in white, at least 2 shades of tan/sand/brownish, a light grey, and occasionally, even a pinkish hue.
It's dense and larger-grained than (very fine) play sand, so has little or no dust, silt, or grime, and will not heavily compact in the way that play sand does. (Re: anaerobic pockets).
In order to avoid anaerobic gas pockets developing, use no more than approx. 2.5" or so in planted areas ( & use root tab ferts), layered to under 1" in open areas.