Aries FilterWorks cartridge uses ResinTech SIR-110-HP, a strong base anion resin. It exhibits an unusually high preference for perchlorate and a low affinity for multivalent ions. This media is supplied in chloride form as a moist, durable, uniform spherical bead. ResinTech SIR-110-HP essentially eliminates all monovalent dumping making it useful in nitrate removal applications. The perchlorate operating capacity is virtually unaffected by the presence of sulfates. About Perchlorates Perchlorate salts, such as ammonium perchlorate and potassium perchlorate, are man-made compounds used as combustion accelerants, primarily in solid-fueled rockets and missiles. It can also be found in some munitions, fireworks, and road flares and is even thought to exist naturally in some nitrate-based fertilizer products. Manufacturing waste and improper disposal of perchlorate containing compounds are increasingly being found in groundwater and local drinking water wells. Perchlorate is one of a newly recognized group of toxins called endocrine disrupters, which can alter hormonal levels, by interfering with iodide uptake in the thyroid gland . The US Environmental Protection Agency, federal agencies and local governments are currently assessing the potential human health risks posed by perchlorate exposure.