The experimental facility currently includes an analytical chemistry laboratory, indoor mesocosms fed by a custom seawater-CO2 blending system and temperature control, laboratory space, as well as outdoor in-water mesocosms. Led by Constance Sullivan, OAEL Manager (casull@uw.edu), this state-of-the-art ocean acidification facility offers unique research and instructional opportunities for experimental manipulations with on-site monitoring of carbonate system parameters. Additionally, the analytical chemistry laboratory is available to run samples on a recharge basis. FHL’s location, facilities, and educational mission combine to make an ideal site for the experimental mesocosm and analytical facility.