Mark, what you posted is di resin... not gfo.I'm going to try the Phosguard, but if you want decently priced GFO try this:
http://www.amazon.com/gp/product/B0...pf_rd_t=101&pf_rd_p=1688200322&pf_rd_i=507846
Mark, what you posted is di resin... not gfo.