Case Study: Groundwater DWTP (AK) - DEXSORB Full-Scale

A DWTP client in Alaska detected elevated PFAS contamination levels in two groundwater wells supplying drinking water to 85 service connections. PFAS concentrations are provided in Table 1, where combined concentration of EPA PFAS6 was detected at 490 to 810 ppt. Before DEXSORB PBF installation, the facility used four GAC filters showing limited removal of PFAS. PFOA, PFOS, PFHxS and PFNA were detected above EPA MCLs in the finished water.

Cyclopure worked with the local water utility service provider to install DEXSORB for removal of PFAS from the drinking water. DEXSORB media was loaded to replace GAC media in one of the filters (see Figure 1). The system is designed to operate at 100 gpm flow rate with a total EBCT of 8 minutes.

Since installation in September 2024, the DEXSORB filter has performed with smooth hydraulics and low pressure drop, providing complete removal of EPA PFAS6 to non-detect levels (< 2 ppt). As of December 17th, 2025, the system has treated over 11,271,651 gallons of water for PFAS removal. Filter capacity, measured by compliance with EPA MCLs, is expected to continue past 24 months from installation.