The ZeroWater ® technology was first patented in 1996. As of 2008, ZeroWater holds 4 patents regarding filters with additional patents pending. ZeroWater introduces water filtering system that removes almost anything from the water, lead, perchlorates, antibiotics, hormones and other contaminants. From the outside Zero Water looks like any other water filtration system, but on the inside it offers a far more advanced filtration technology. Zero Water sells different water filtration units. The main pitcher system sells for $39.00 and the water cooler system sells for $99.00, which is useful for businesses. Since with ZeroWater technology water undergoes 5 stages of purification, the water takes a long time to be filtered. Zero Water system filters can be recycled free of cost. Customers send the used filters back to Zero Water and get a shipping discount for their next purchase. Please try to contact Zerowater Customer Service directly prior to posting any complaints on this site.