Product review (2 stars): Certified only to improve AESTHETICS and TASTE, unrelated to health!
AquaCrest filters marginally improve the taste of hard water in Las Vegas, but are only ANSI 42 certified, as opposed to ANSI 53.  That is, they only improve the water on an aesthetic or non-health-related basis (chlorine and sediments).  To advertise these as removing impurities and contributing to "fresh" water is a bit of a stretch.  In 9 months, we'll be looking for ANSI 53 filters and won't purchase these again.