Full-Scale DEXSORB® System for Drinking Water PFAS Removal in Nikiski, Alaska

Background

In 2024, Cyclopure was asked to install DEXSORB media to replace GAC at a community drinking water facility in Nikiski, Alaska. Drinking water is sourced from ground water, with elevated levels of PFAS (around 700 ppt of EPA Regulated PFAS). Before DEXSORB PBF installation, the facility used four GAC filters showing limited removal of PFAS.

DEXSORB Installation

Cyclopure worked with a local water utility services provider to install a full-scale DEXSORB PBF system for PFAS removal from drinking water. DEXSORB media was loaded to replace the GAC media in one of the filters and is projected to effectively remove PFAS to below EPA MCLs over a two-year operation period. 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 vessel has shown smooth hydraulics with low pressure drops and complete removal of EPA PFAS6 to non-detect levels (< 2 ppt). As of July 30, 2025, the system has treated over 8,565,853 gallons of water for PFAS.

Engineered PFAS-filtration system in Nikiski, Alaska.

Another angle of the engineered PFAS-filtration system in Nikiski, Alaska.

Cyclopure engineers in front of the DEXSORB-packed vessel.