Clay swells when wet and shrinks when dry, the latter can open up deep fissures in it that act as channels for unfiltered water to flow down deeper than you may expect, leaving aside tectonic activity or other reasons that could cause such penetrations in the ground. The native plants also have impressively deep root systems that can provide similar gaps, and you may never know if it was there or not if the clay got wet again and sealed up the voids along with any presents washed down and absorbed into the clay matrix. It puts a lot of faith in Bo Taylor to break his back digging way way deep beyond the reaches of this above plus the necessary amount for scrubbing whatever waste may have gotten down that far… I agree it’s not especialy likely as far as bacterial infection alone, I just protest at the absolutely no risk formulation. There’s a reason bags of this stuff are sold as ‘novelty items’ rather than going through FDA approval.
Clay swells when wet and shrinks when dry, the latter can open up deep fissures in it that act as channels for unfiltered water to flow down deeper than you may expect, leaving aside tectonic activity or other reasons that could cause such penetrations in the ground. The native plants also have impressively deep root systems that can provide similar gaps, and you may never know if it was there or not if the clay got wet again and sealed up the voids along with any presents washed down and absorbed into the clay matrix. It puts a lot of faith in Bo Taylor to break his back digging way way deep beyond the reaches of this above plus the necessary amount for scrubbing whatever waste may have gotten down that far… I agree it’s not especialy likely as far as bacterial infection alone, I just protest at the absolutely no risk formulation. There’s a reason bags of this stuff are sold as ‘novelty items’ rather than going through FDA approval.