To compare the ZeroWater filter to the Brita filter, take water samples from both, and then use a water-tester to compare the amount of compounds detected in each. The results of a laboratory test that compared the two are located at ZeroWater.com.
ZeroWater has a five stage dual-ion exchange filtration system, whereas Brita uses a carbon and ion filtration system. Both Brita and ZeroWater filters remove inorganics, metals, pesticides and volatile organic compounds.
An EPA-certified laboratory unaffiliated with either company compared the two filters. The results indicated that ZeroWater reduces 99 percent of inorganics, 98 percent of metals, 99 percent of pesticides and 93 percent of volatile organic compounds, whereas Brita reduces 44 percent of inorganics, 88 percent of metals, 69 percent of pesticides and 59 percent of volatile organic compounds. These compounds are primary and secondary contaminants in drinking water, according to the EPA.
ZeroWater and Brita offer a wide range of products that utilize their filtration systems. These products, listed at ZeroWater.com and Brita.com, include dispensers, pitchers, portable bottles and replacement filters. The websites offer the specifications for each product along with the prices and methods for purchasing them. Ultimately, the better product is determined by the user's preferences and requirements regarding water purity.