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
Lower-Cost Alternative
US-ST04 Tier1 Undersink Smart Tap System
In Stock
1 Filter
Save $32.00
Your Current Selection
US-EZ-4 Culligan Level 4 Easy-Change Undersink Filter System
In Stock
1 Filter $91.99
  • Product Comparison
  • Instructions
  • Frequently Asked Questions
  • Compatibility
  • Details
Lower-Cost Alternative Your Current Selection
Price Per Filter As Low As $59.99 per filter with 1 pack As Low As $91.99 per filter with 1 pack
Model US-ST04 US-EZ-4
Certifications NSF/ANSI Standard 42, NSF/ANSI Standard 53, NSF/ANSI Standard 401 NSF/ANSI Standard 42, NSF/ANSI Standard 53
Filter Life (gallons) 651 500
Filter Life (months) 6 months
Primary Filter Media Carbon Block
Warranty Guarantee 2 year limited warranty