rjrgroup;933121 wrote: Out the office today, I can send you some independent isotherms maybe tomorrow or next week. We get most of our definitive results from pilot studies where we due our own field testing. One of the most difficult tasks we challenge is when supply water has trace phosphate. GFO has such a high affinity for the phosphate, we can't get the our primary contamination specialty, arsenic, out due to saturation from phosphate. We have had about 7,000lbs of AA for over 3 years now and can't find an application where it out performs GFO.