Under Sink Water Filter

An under sink water filter gives you clean, great-tasting drinking water straight from your kitchen faucet, with nothing taking up space on the counter. The USA-100 Under Sink Water Filter is our made-in-USA replacement for the discontinued NSA 100S* and NSA 100SX* under counter filters. It hooks up to your existing water line and faucet.

Why choose the USA-100

  • 5-stage filtration with bacteriostatic GAC/KDF media that prevents bacteria growth for 36 months
  • 25,000-gallon capacity
  • Improves taste, eliminates odors and removes color
  • Connects to existing water lines, with quick connect or compression fittings
  • Compact: 14" tall and 5" in diameter
  • 1-year pro rata warranty, made in the U.S.A.

Under sink, countertop or whole house?

Prefer not to install anything under the sink? The USA-50 countertop water filter (NSA 50C* replacement) connects to your faucet in minutes. Want filtered water at every tap? See our whole house water filters. Still deciding? Read Whole House vs. Under Sink Water Filter: Which Do You Need?

*NSA is a trademark of its respective owner. USA Filtration is not affiliated with NSA.