The Clear2O CWS100 is part of the Water filter is rated on multiple criteria, such as those listed below.
Lead removal: Lead removal indicates the percentage of lead that was removed by each filter.
Chloroform removal: A filter’s ability to remove chloroform predicts how well it will remove organic compounds as well as byproducts created by disinfectants used by water systems.
Flow rate: Flow rate is how fast a gallon of water filtered through the cartridge. The criteria for flow rate scores differ between different types of filters. Faucet-mount, countertop, and undersink models have the same criterion; carafes and reverse osmosis models each have their own.