Airashell from Anua is a modular biofilter with a small footprint. The air treatment system removes a variety of noxious odor compounds, including over 99 percent hydrogen sulfide, and can handle high variability in compound concentrations. It is prepackaged with recycled seashells, which protects the environment while reducing solid waste. The seashell media acts as a host for biological activity and a catalyst for pH neutralization. 336-547-9338; www.anuainternational.com