Get the Aquasana AQ-4000 Countertop Water Filter which drops from $114.27 to $57.13 at Aquasana. That's 50% off! Plus, shipping is free. This is the lowest price we could find by $37. This filter has a twin cartridge with a 3 stage filtration system, allowing it to reduce contaminants from your tap water such as microscopic particles, odor, and chlorine/chloramines. This item comes in 3 colors: white, black, and brushed. 84 reviewers give this item an average review of 4.4/5 stars. Sales tax may apply to some select states.