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Save $7.99 and buy a Best Buy. The dual-filter Aquasana 4000 Undercounter and the Aquasana 4100 Shower Filter are an excellent combination water filtration system. This combination provides the maximum in water filtration and showering pleasure. Certified for sale in California (the toughest environmental regulations in the country) and everywhere else. For municipally treated water only. This product can be used only with the supplied faucet and is not designed to be used in constant pressure applications, such as ice makers or fountains. A Premium faucet is available - order the AQ4000C Countertop and add the Premium Undersink Installation Kit. Ships free in the Continental US.