Gravity Filters

glass of water on wooden table plant shadow background

Why The Filterium?

✅ NSF/ANSI Certified Products
We prioritize water filters officially certified by the NSF, WQA or IAPMO

✅ We Filter the Filters
Only the best-performing systems make it to our shop.

✅ Real Science, Not Marketing Claims
We cut through the noise and show you what actually works.

Not sure where to start?

Don’t waste money on filters that don’t work. Our expert-backed guides and test results break down what really matters in water filtration so you can make confident, data-driven decisions.

Visit Learning Center
British Berkefeld gravity water filter with two ultra sterasyl filters top view

Gravity Filter Replacements, Simplified

Don’t waste time comparing dozens of cartridges. We’ve curated the best-performing replacements for fluoride, bacteria, and chlorine—independently tested, easy to install, and built to last.

  • Fluoride filters
  • Ceramic elements
  • Compatible with British Berkefeld, Berkey, and more
Browse All Filter Replacements

Filter Claims Are Easy. Certification Is Not.

  • NSF WQA ad IAPMO certification logos

  • At The Filterium, we prioritize filters that meet performance standards verified by independent labs—not just manufacturer claims. Many of our products are tested and certified by:

    • NSF International
    • WQA (Water Quality Association)
    • IAPMO R&T

    We verify these claims ourselves, and only carry filters that prove their performance.
Learn About Certifications


The Filterium offers a curated selection of gravity water filters, reverse osmosis systems, and tested water filtration solutions for homes, apartments, and off-grid use. Our mission is to help you find certified water filters that truly remove contaminants like fluoride, PFAS, lead, and more.