NanoMetix Gravity Feed Water Filters

Gravity Feed Filter Comparison

Which Gravity Feed Filter Is Right for You?

Greenfield gravity feed filters are designed to fit many leading gravity systems and support different water quality needs.

The best choice depends on your water source, desired flow rate, contaminant concerns, and maintenance preferences.

NanoMetix™

CeraMetix™

Aquametix®

NanoFiber™

Best For

Customers wanting advanced broad-spectrum filtration for well or city water

Customers needing strong sediment, microbial, and broad-spectrum contaminant reduction support

City water users wanting strong broad-spectrum contaminant reduction with a faster drip rate

City water users wanting fast flow, low maintenance, and strong everyday filtration support

Recommended Water Source

City or well water; untreated surface water may require additional disinfection depending on source conditions

City, well, or untreated surface water; additional disinfection may be needed for untreated surface water depending on source conditions

Best suited for city water

Best suited for city water; not recommended for untreated well or surface water with sediment or iron concerns

Filtration Approach

Dual-layer design using an electrokinetic outer layer with an internal carbon block core

Ceramic outer shell with internal broad-spectrum contaminant reduction media

Carbon-based broad-spectrum gravity filtration with faster flow than ceramic-style filters

Electro-positive nanofiber media designed for fast flow and sub-micron particle capture

Contaminant Focus

Designed to address particulates, chlorine/chloramine, VOCs, PFAS, fluoride, heavy metals, pesticides, herbicides, pharmaceuticals, and more

Designed to address sediment, bacteria, cysts, chlorine, VOCs, fluoride, heavy metals, pesticides, herbicides, pharmaceuticals, and more

Designed to address chlorine/chloramine, VOCs, fluoride, heavy metals, nitrates/nitrites, pesticides, herbicides, pharmaceuticals, and more

Designed for city water concerns including particulates, taste, odor, and broad everyday contaminant reduction support

Microbial / Particulate Support

Strong fine particulate support; surface or wild water may still require disinfection depending on source conditions

Strongest choice here for sediment-heavy or biologically variable water sources; ceramic shell can be cleaned as needed

Not the first choice for untreated or sediment-heavy water

Strong sub-micron particle capture, but not recommended for untreated well or wild water due to clogging concerns

Flow Profile

Designed for high-performance gravity filtration with minimal flow restriction

Typically slower than non-ceramic options, especially as sediment accumulates

Faster drip rate than ceramic-style filters

Fastest-flow option in this comparison

Maintenance

Handle gently; rinse/flush according to instructions and avoid damaging the pleated outer layer

Washable ceramic shell can be gently cleaned to restore flow

Flush before use; replace when flow, taste, or performance changes

Outer wrap may be gently rinsed to restore flow; do not scrub like ceramic

System Compatibility

Fits Berkey and many leading gravity systems; available in standard and imperial sizing

Fits Berkey and many leading gravity systems; imperial size not for Sertodo systems

Fits Berkey and many leading gravity systems; imperial size not for Sertodo or Terra2 systems

Fits Berkey and many leading gravity systems

Included Filters

One filter for the top reservoir

Two filters for the top reservoir

Two filters for the top reservoir

One filter for the top reservoir

Mineral Bag

Optional mineral bag available

Optional mineral bag available

Optional mineral bag available

Optional mineral bag available

Important Notes

Do not mix filter types. Not compatible with red dye tests. For untreated surface water, consider additional disinfection depending on source conditions.

Do not mix filter types. Ceramic shells are breakable and should be handled gently. Not compatible with red dye tests.

Do not mix filter types. Not compatible with red dye tests. Best for city water use.

Do not mix filter types. Not compatible with red dye tests. Best for city water; sediment and iron can shorten lifespan or cause clogging.

Quick Guidance

Choose NanoMetix™ if…

• You want our advanced broad-spectrum gravity feed option

• You are filtering well or city water

• You want strong contaminant reduction support without a ceramic shell

ChooseCeraMetix™

if…

• You have well, wild, or sediment-prone water

• You want a washable ceramic shell

• You want strong support for microbial and fine sediment concerns

Choose Aquametix® if…

• You primarily use city water

• You want broad-spectrum chemical contaminant reduction support

• You want a faster drip rate than ceramic-style filters

ChooseNanoFiber™

if…

• You use city water and want the fastest-flow option

• You want a simple, low-maintenance filter

• Your water is not sediment-heavy or iron-heavy

Still not sure which gravity filter is right for yo…