NSF-referenced · 0.0001 micron · no hype
Know what your filter
actually removes
before you buy it
Reverse osmosis, softeners, carbon, UV and whole-house systems — how each one works, what the certifications mean, and honest comparisons of what you can buy today.
TDS reduction
typical 4-stage RO
IN 320 ppm
MAINS SUPPLY
OUT 8 ppm
97.5% REMOVED
320 SED
240 CARB
22 RO
8 POL
Guides
—
Topics
—
Stages
4
01
Sediment
Grit, silt and rust — 5 to 20 micron
02
Carbon
Chlorine, taste and odour, VOCs
03
Membrane
Dissolved solids at 0.0001 micron
04
Polish
Remineralise, UV, final carbon
Latest guides
Browse by topic
Every technology we cover, and what each one is for.