We recommend the Multi-Pure MP750SB under-sink water filter. It is Consumer Reports’ top rated under-sink filter, with a rating of 90 out of 100. It has a wide range of NSF Standard 53 contaminant reduction (NSF is an industry-standard filter certifier). The yearly maintenance costs are also low, making it good value for money in terms of the Cost Per Contaminant (CPC) Ratio.