Glenn, We have no naturally occurring pumice here in FL either but I found that some nurseries and landscaping businesses sell lava rock to use in landscaping projects. *I bought a basketball size piece (too small for them to use) for a buck. *Use an old wood rasp or even another rough rock to rub it into a small enough grit to use for your Pings. *I have been grinding on it for about a year and still have ½ of it left.
Joseph, I hope I am correct about pumice being a product of lava rock?[img]http://www.**********.com/iB_html/non-cgi/emoticons/new/confused.gif[/img]