Discount Water Filters and Air Filters at Discount Filter

When we protect your filter purchase with our No Worries Guarantee, we mean it!

No Worries...
  • Your filters are guaranteed to be the right fit!
  • Our products are price match guaranteed!
  • Our customer service team is guaranteed to answer your call!
  • You’re guaranteed to find expert help!

Learn more about our No Worries Guarantee

US-ST04 Tier1 Undersink Smart Tap Replacement Filter Cartridge

More Views

US-ST04 Tier1 Undersink Smart Tap Replacement Filter Cartridge

Save 18% (MSRP: $66.99)
0 0


The Tier1 US-ST04-R undersink filter is the perfect addition to your kitchen sink, filtering over 50 contaminants potentially in your water. This easy-to-install filter will give you clean, fresh, great-tasting water in no time at all! Simply mount the bracket and filter under your kitchen sink cabinet, hook it up to your cold water line with the water supply adapter (included), and away you go! The filter and system has been tested against NSF standards 42, 53, and 401 for reduction of substances such as bad Chlorine taste and odor, Turbidity, Mercury, Lead, some pharmaceuticals, and more! There's no need to waste money and space on counter top systems and bottled water, Tier1 offers all the filtration you need with the Tier1 US-ST04 Undersink System and filter. Order today!

  • Reduces Chlorine Taste and Odor, Lead, Mercury, and more!
  • Easy installation!
  • Over 650 gallon filter capacity
  • Sleek, space-saving design


Package Qty 1
Manufacturer's Id US-ST04-R
UPC 641945752366
Actual Size (in) 16.25 inches (length) x 4.125 inches (width) x 4.5 inches (depth)
Primary Filter Media Carbon Block
Filter Life (gallons) 651
Filter Life (liters) 2464
Micron Rating (Nominal) 1
Operating Pressure (psi) 40 - 120
Operating Temperature (°F) 33 - 100
Operating Temperature (°C) 4.4 - 37.8
Flow Rate (gpm) 1.25
Flow Rate (lpm) 4.73
Fitting Size (inches) 3/8 inch
Color / Finish Gray
Chlorine Tolerance 95.5%
Certifications NSF/ANSI Standard 42, NSF/ANSI Standard 53, NSF/ANSI Standard 401
Includes Smart tap replacement filter cartridge

The TIER1-US-ST04-R is comparable with the following part numbers