PFAS For analysts that need to automate the SPE method for the determination of PFAS compounds in drinking water following the updated EPA method 537.1, 533, and 1633, the FREESTYLE XANA is the only system available that offers complete automation of the entire SPE. Unlike other platforms that require manual intervention steps and struggle with high blank values, low recoveries and limited sample throughput, the FREESTYLE XANA platform provides reliable 24/7 operation and meets all performance standards of the method.