Baroid Aqua-Clear® PFD is a phosphate-free, non-fermenting, concentrated liquid polymer dispersant that facilitates exceptional mud and sediment removal from the producing formation and gravel pack. Highly effective as a mud thinner, Aqua-Clear® PFD can also disperse sediment and clay from the producing formation and gravel pack in the screened interval. NSF/ANSI Standard 60 certified. To use, determine the volume of water in the well and double it. Use one gallon of Aqua Clear® PFD per 500 gallons of water. This is a ratio of 0.2% by volume.