Many under-sink filters clog quickly or lose effectiveness after just a few hundred gallons, driving up cost and maintenance.

The ESD US4 under-sink filter uses a combination of granular activated carbon and KDF-33 media to deliver long-life performance with strong reduction of chlorine, off-tastes, and many common dissolved contaminants. Installed under the sink with a dedicated faucet, it quietly treats water for drinking, cooking, coffee, and ice.

The hybrid media bed addresses both chemical and particulate concerns while resisting bacterial growth inside the cartridge, which extends useful service life compared to many single-media designs. That means fewer cartridge changes, less waste, and a lower true cost per gallon. For households that want municipal-style treatment quality on a single tap, this unit provides an efficient, durable option anchored in proven media technology.