Re Hydroton Mfg. out of business.
A replacement might be Pumice Stones.
Just West of Superior on the South side of the highway is a posted site for Apache Tears. I'm not sure if the site is still available to the public, but it used to be a "Pay to Find Apache Tears" site.
I think this is what we need. The site is gravely and might lend itself to on site grading with a pair of grading screens.
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