CRYSTAL QUEST Countertop Replaceable Single Ceramic Water Filter System Quick and easy to install and use, stylish, convenient and effectively removes harmful bacteria. removes harmful bacteria such as E. Coli, Fecal coliform, Salmonella, Streptococcus, and cysts. The cartridge can be cleaned up to 30 times (about once a month). Sits on the counter and easily connects to any kitchen faucet. A diverter valve switches between filtered and unfiltered water.