The real cost

Reverse osmosis isn’t cheap. It just hides the bill.

It feels free after the install — then quietly bills you every month in filters, wasted water, and power that no one ever adds up. Counted honestly, a typical system runs $300–$585 a year. Here’s that bill in full — and what Aurmina costs beside it.

What RO costs — and hides

The bill no one adds up.

Here’s the yearly cost of a typical under-sink system serving two — the one that never shows up as a single number.

System + professional install, spread over its life
$50–$125
Replacement filters + membrane
$80–$150
Water poured down the drain, on your utility bill
$80–$130
Electricity (pump systems)
$0–$40
Remineralization cartridge — to make the empty water drinkable, where fitted
$0–$90
True cost, every year
$210–$535

The wide range is mostly local water rates, which vary by a factor of three; the typical case lands near $350 a year. The drain line uses the EPA’s own figures — a point-of-use system discards about 5,320 gallons a year to deliver roughly 940, costed at the American Water Works Association 2023 residential average of $15.21 per thousand gallons. Whole-house RO runs higher still: $480–$900 a year to operate, on top of a $2,000–$8,000 install.

Now — what Aurmina costs

About two bottles a year.

At a typical one-teaspoon-per-gallon dose, a couple uses roughly two 32 oz bottles a year — as little as one on reverse-osmosis water, more if your tap runs heavily burdened. Buy them the way you already pay for everything else — ahead, for the year — and the price drops fast.

  • A bottle at a time · 6 months

    $149.99each

    $300/yr

    ≈ $25 a month

  • 3-pack · 18-month supply

    $349.99$449.97

    $233/yr

    ≈ $19 a month

  • Best value

    6-pack · 3-year supply

    $599.99$899.94

    $200/yr

    ≈ $17 a month

The same bill, added up the same way.

Every line the RO table carries, counted here too — including the ones that come to nothing.

Aurmina — bought ahead, through to a bottle at a time
$200–$300
Gravity filter system, spread over its life (about 7 years)
$36–$50
Replacement elements — ceramic, and a carbon cartridge if fitted
$22–$49
Water poured down the drain, on your utility bill
None
Electricity
None
Remineralization cartridge — to make the empty water drinkable
Not needed
True cost, every year
$258–$399

Three of those lines are blank, and they are the three that make reverse osmosis expensive. Nothing is sent to the drain, nothing is plumbed in, nothing draws power — and there is no remineralization stage, because here the minerals are the product rather than something added back at the end.

You can also run it for less. Filtration is optional: let the treated water settle and pour off the clear column, and the hardware lines disappear — $200–$300 a year, all in. With a gravity housing and a ceramic element, $245–$360. With a carbon-bearing cartridge as well — the only configuration that addresses PFAS — $260–$400. Every one of them lands under a fully-counted under-sink RO. We do not yet publish a recommended filter, because we have not finished the testing that would earn it; the figures above use representative market prices.

That’s the whole trick. An RO owner already pays ahead — a big install, then a little every month, forever. Aurmina just shows you the number. Plan for the year, and it’s about seventeen dollars a month.

The bigger difference

RO doesn’t just cost more. It hands you empty water.

Reverse osmosis and distillation strip water toward zero — every mineral gone along with the contaminants. What leaves is more than the minerals themselves. The four working properties of water go with them: nothing left to give or take an electron, nothing available to exchange, nothing to buffer a shift in pH, and nothing dissolved for the water to form hydration shells around. Those are measurable properties, and stripped water measurably lacks all four.

What remains is not neutral either. Stripped bare, water turns aggressive: chemically hungry, it pulls minerals back out of whatever it touches — leaching metals from your pipes on the way to the glass, and working against your own mineral balance once you drink it.

RO & distilled — empty water

Biologically aggressive

  • Demineralized and chemically hungry — corrosive to plumbing, leaching metals into the water it carries
  • In the body, it drives increased urine output (diuresis) and greater loss of water and electrolytes
  • Raises elimination of minerals like sodium, potassium, and chloride — pushing toward a negative mineral balance
  • A remineralization cartridge only puts a small fraction of minerals back

Aurmina — living water

Biologically supportive

  • Hundreds of contaminants removed, the water’s own minerals kept — and broadened
  • Mineral-balanced and redox-balanced: clean without being stripped
  • Not aggressive — it doesn’t leach your pipes or work against your body
  • Water with the mineral character the earth gives it

The World Health Organization’s review Health Risks from Drinking Demineralised Water (Kožíšek, 2005) documents exactly these effects — increased diuresis, higher urinary elimination of electrolytes, and negative mineral balance — and concludes demineralized water is not suitable as regular drinking water.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

And if you plan ahead…

Buy it smart, and it’s not even close on dollars either.

Set the 6-pack against a fully-equipped RO — the kind you’d actually want, remineralization and all, honestly counted at the high end:

Aurmina, bought ahead

$200 /yr

Under-sink RO, fully loaded

$585 /yr

You save about $385 a year — roughly $3,850 over a decade — and still waste zero water and drink living water instead of empty water.

The cost that never hits the receipt

And the one that may matter most.

75–90% of RO water, wasted

Residential reverse osmosis recovers only 10–25% of the water it touches. For every glass you drink, 3 to 20+ glasses go straight down the drain.

In a world already short of fresh water, that may be the cost that should sting the most. Aurmina wastes none — every drop you treat, you drink.

Plan for the year. Drink better. Waste nothing.

Less than reverse osmosis at a typical dose — with none of the plumbing, none of the waste, and living water at the end of it.

Shop the 6-pack