Get 10% off your First Order with promo code: Welcome10

Shop Now
Not Logged In

to view your profile

Undersink Water Filters

Undersink filters are a point of use option for quality water filtration. A quickly evolving field in water filtration, under-sink systems are becoming more sleek and compact while replacement filters are becoming smarter and more adaptable, some featuring turn to lock installation and other quick change options. No matter what room you designate the filter for it will allow you to provide filtered fresh water right from the faucet. Enjoy better tasting water with Tier1 today!
Read more
Clear All

1 - 10 of 22

1 - 10 of 22

  1. Undersink Systems
  2. Undersink Replacement Filters
Shop By
Undersink Water Filters
Primary Filter Media
Fitting Type
Fitting Size (inches)
Advertised Size (in)
Micron Rating (Nominal)
Filter Life (months)
Filter Life (gallons)

Free Shipping on all orders over $35!

Save even more money. Buy more than $35 worth of Tier1 Products and we will take care of the shipping.

Shop Now

Find the Best Solution for You

Let Tier1 help you find the best products for your Family. Answer a few short questions and we will provide you with a customized solution for your water needs.

Sign Up

Contact our Service Team Toll-Free

Our highly trained Service Team is here to serve you! They are ready to answer your questions and place your order.


Tier1 Satisfaction Guarantee

Tier1 is dedicated to ensuring that all of our products provide superior quality and performance. From our engineers to your home, our company works to provide the best filters at the best prices.

Learn More
Scroll To Top