Clearbrook 3.25 Gallon Stainless Steel Gravity System

Clearbrook filters are independently lab-tested to remove over 99% of more than 365 common contaminants across these categories:

Heavy metals
Lead, copper, mercury, arsenic, cadmium, chromium (hexavalent), aluminum, barium, nickel, selenium, uranium, and 13 more

PFAS / "forever chemicals"
Including PFOA, PFOS, GenX, PFBS, PFNA, PFHxA, and other regulated compounds

Disinfectants and byproducts
Chlorine, chloramine, haloacetic acids (HAAs), trihalomethanes (TTHMs)

Pharmaceutical residues
Acetaminophen, ibuprofen, antibiotics, hormones (estradiol, estrone, testosterone), caffeine, BPA

Pesticides and herbicides
Atrazine, glyphosate, DDT, lindane, chlordane, and over 50 others

Volatile organic compounds (VOCs) Benzene, vinyl chloride, trichloroethylene, MTBE, and dozens more

Semi-volatile compounds (SVOCs) Including PCBs, phenols, and polycyclic aromatic hydrocarbons

Phthalates
Plasticizers commonly found in modern water systems

Microplastics
Over 99.99% removal

Radiological elements
Gross Alpha (Thorium 230) and Gross Beta (Cesium 137)

Nitrates, nitrites, sulfates, and other inorganic compounds

For the complete contaminant-by-contaminant breakdown with specific removal rates, [view our lab results].

Clearbrook gravity-fed systems use multi-stage filtration through specially engineered filter elements. Pour tap water in the upper chamber; gravity pulls it through the filter elements into the lower chamber. The filter elements physically block, chemically adsorb, and ion-exchange contaminants out of the water — leaving the natural minerals your body needs while removing what shouldn't be there. No electricity, no chemicals, no pumps required.

The answer depends on which Clearbrook system you have:

Under-sink filters (Gen4 and Dual Filter System)
are independently tested to remove over 90% of sodium fluoride during normal filtration. If fluoride removal matters to you and you're choosing an under-sink system, you're already covered.

Gravity-fed countertop systems
focus on a broader range of contaminants and don't directly target fluoride at the same level. For households with gravity systems that want fluoride and arsenic removed, we offer the Clearbrook PF-2 Fluoride & Arsenic Reduction Elements — designed to install onto your existing Clearbrook elements. Independent testing shows typical fluoride reduction greater than 95%, and under optimum conditions, greater than 99.75%.

Both deliver clean, lab-tested water — the difference is how you get to it.

Gravity-fed systems sit on your counter. Pour tap water in the top, let gravity pull it through the filter elements, and dispense clean water from the spigot at the bottom. No plumbing, no electricity, no installation. Works on any water source — municipal, well, or surface.

Under-sink systems install on your home's cold water line and deliver filtered water on demand from your tap. Faster flow, no countertop space needed, but designed for municipally treated water only (not well water with iron or sulfur). Both under-sink models require maximum 60 PSI water pressure and cold water only — never connect to hot.

If you want simplicity, portability, and any-water-source capability — go gravity. If you want filtered water at the turn of a tap and you're on city water — go under-sink.

A good rule of thumb: pick the size that matches your daily filtered-water use, then size up if you cook, bake, or fill water bottles for a household on the go.

1.5 Gal
singles, couples, small kitchens. Daily-use simplicity.2.25 Gal — small families, low-to-moderate water use.

3.25 Gal
mid-size families and households that drink and cook with filtered water daily.

4.5 Gal
larger households, heavy users, or families that fill bottles for school and work.

6.0 Gal
large families, group homes, churches, ministries, or community-style shared use.When in doubt, size up. A larger system means fewer refills — and you'll never regret extra capacity in an emergency.

Each set of Clearbrook gravity-fed elements is rated for up to 3,000 gallons — years of clean water from a single replacement. Actual lifespan depends on water source and household use:

Light use (1–2 people): 2 to 3 years per set

Medium use (3–4 people): 1 to 2 years per set

Heavy use (5+ people): 10 to 12 months per set

Heavily contaminated source water (well or surface) shortens lifespan further. A noticeable decrease in water flow is the best indicator that it's time for a new filter.