Thanks for all the help. I spoke to the manufacturer and it makes such little difference that it isn't worth it. Just a marketing ploy. The difference in the degradation is minimal 5-6 month from standard BB's although they will tell you that there testing shows otherwise (the conditions were greatly in there favour and not at all similar to ours). The chemical make up is similar and not at all harmfull in the amounts we will be exposing the land to.