Pressure drives separation
A pump pushes feed water against the membrane far harder than nature would. Water is small enough to squeeze through — contaminants are not.
Engineered on decades of water science. Filtering what matters — so you can drink with confidence.
How reverse
osmosis works
Pressure forces water through a membrane with pores just 0.1 nanometres wide. Water slips through. Parasites, bacteria, PFAS and other contaminants can't — so they're rejected and flushed away.
FEED WATER
Under pressure
PURE WATER
Water only
RO MEMBRANE · 0.1 nm PORES
Water
Parasites & bacteria
PFAS
Pharmaceuticals
Heavy metals
Rejected by size and charge
At 0.1 nanometres, the pores are smaller than almost everything but a water molecule. Larger contaminants are physically blocked, while charged molecules are repelled at the membrane surface.
Flushed, not stored
Rejected contaminants never build up inside the system — they leave with the drain stream. Nord's 3.5:1 ratio does this with 78% less waste than standard RO.
Next, UV-C sterilisation neutralises any microbe that slips past the membrane — then remineralisation restores a balanced pH 7.5–8.5 profile.
Sterilise.
Then restore.
The membrane strips contaminants — but the protocol isn't done. UV-C light neutralises anything biological that slips through, then minerals are added back in balance.
Stage 02
UV-C · 254 nm
Kill what filtration can't
UV-C LAMP
Bacteria and viruses small enough to pass an RO membrane are hit with 254 nm light that scrambles their DNA — stopping them from replicating. No chemicals. No byproducts.
>3-logpathogen inactivation
0disinfection byproducts
Stage 03
pH 7.5–8.5
Restore the balance
pH 6.07.08.5
pH 6.0
Pure RO water is clean but empty — and turns acidic. Calcium, magnesium and potassium are dosed back in the right ratio, lifting pH to the range of natural spring water.
Ca · Mg · Kminerals restored
7.5–8.5balanced alkaline pH
Low-magnesium water is linked to higher cardiovascular mortality at population scale, and bicarbonate-rich alkaline water has been shown to reduce bone-resorption markers — which is why Nord Osmosis remineralises rather than serving demineralised water. Helte et al., Environment International 2022 · Wynn et al., Bone 2009. Observational & small-trial evidence; not medical advice.
The evidence,
in full
Every claim we make traces back to published, peer-reviewed science. Expand any study to see who ran it, what they found, and why it matters. These are mostly observational findings — they describe associations, not proof of cause — but together they make the case for filtering, and for putting minerals back.
Almost every study here is observational; none proves that unfiltered tap water will harm a specific person. Nord Osmosis treats this body of work as converging evidence that justifies precautionary filtration. Nothing here is medical advice.