PermaTreat PC-191T combines the product reliability of PermaTreat PC-191 with patented TRASAR® Technology for advanced monitoring and control. PermaTreat PC-191T is a highly effective scale inhibitor who actives components were developed to treat reverse osmosis (RO) systems. PermaTreat PC-191 has shown for over 20 years excellent performance against the following scalants: calcium carbonate, calcium sulfate, barium sulfate, strontium sulfate, calcium fluoride, silica and iron.