A process for reducing the fluorosurfactant content of a stabilized
fluorosurfactant-containing aqueous fluoropolymer dispersion by passing
dispersion through a first fixed bed of anion exchange resin to reduce
fluorosurfactant content. The first fixed bed has a working zone which
moves though the column as the ion exchange resin is saturated. The
process includes monitoring a property of the dispersion as the
dispersion exits the fixed bed to determine break though of the working
zone indicating saturation of the fixed bed. The property being monitored
is selected from the group consisting of pH and conductivity.