What a Stefani filter removes (and what it doesn't).

Qué elimina (y qué no) un filtro Stefani

Fewer promises, more evidence

In the world of water filtration there are too many nice promises and very few clear explanations.
“Pure water,” “eliminates everything,” “the best on the market.” Big phrases, small evidence.

If you're going to make a decision that affects something as basic as the water you drink every day, you shouldn't rely on slogans. You should demand evidence .

This article exists precisely for that purpose: to explain what a Stefani filter actually removes , what it doesn't , and why , using data and technical criteria, not marketing.

The real problem: confusing filtering with miracles

A water filter is not magic .
Not all systems serve the same purpose, and none eliminates "everything" without consequences.

When a brand promises absolute results without explaining how , under what conditions , and with what evidence , be suspicious. In filtration, what matters is not what is said, but what can be proven .

How a Stefani (smoke-free) filter works

Stefani filters use a three-stage natural filtration system, handcrafted in Brazil and backed by independent laboratory studies:

  1. Microporous clay

  2. Activated carbon

  3. Colloidal silver

Each layer serves a specific function. Let's take it one step at a time.

What a Stefani filter DOES remove

🦠 Bacteria and microorganisms

Thanks to the combination of controlled porosity and colloidal silver , Stefani filters eliminate bacteria and microorganisms present in the water.
Silver acts as a bacteriostatic agent, preventing its proliferation.

👉 This is not a belief: it is validated by microbiological tests .

🚱 Chlorine

Activated carbon effectively removes chlorine, which is responsible for bad taste, odor, and the degradation of the organoleptic quality of water.

Result: water that tastes like water again.

🧪 Heavy metals (significant reduction)

Stefani filters reduce the presence of heavy metals such as:

  • Lead

  • Copper

  • Iron

They don't "magically make them disappear," but they do reduce their concentration to safe levels , which is key to understand.

🧬 Microplastics

The microporous structure of the filter allows it to retain microscopic particles , including microplastics present in tap water.

This is especially relevant with regard to bottled water, where various studies have demonstrated the presence of microplastics in virtually all samples analyzed.

🌾 Sediments and solid particles

Sand, mud, oxides and other particles are physically retained in the filter, improving clarity and visual cleanliness of the water.

What a Stefani filter DOES NOT remove (and why that's honest)

Here comes the part that many brands avoid explaining.

❌ Dissolved salts and natural minerals

Stefani filters do not remove beneficial minerals such as calcium or magnesium.
And this is not a flaw: it is a conscious decision.

Completely removing minerals (as reverse osmosis systems do) produces "empty" water, which then needs to be artificially remineralized.

Stefani focuses on filtering out what's unnecessary, not what the body needs .

❌ Very specific dissolved chemicals (100%)

No serious home filtration system can claim to remove 100% of all possible chemical compounds under any conditions.

Whoever says that is either lying or doesn't understand what they're selling.

Filtering is not the same as denaturing water

There is an obsession with "eliminating everything" that is rarely questioned.
The correct question is not how much you eliminate , but:

What do you eliminate, what do you keep, and why?

A good filtration system:

  • Improves water quality

  • Reduce relevant pollutants

  • It retains natural minerals.

  • It does not need electricity.

  • It does not generate constant plastic waste

  • It does not depend on empty promises

The question you should always ask any brand

Before buying a filter, ask yourself just one question:

Where are the studies that support what you're saying?

If there are no clear reports, tests, or certifications:

  • It's not a leak, it's marketing.

  • And marketing doesn't improve the water.

Our position on LaStefani.com

At LaStefani, we don't believe in grandiloquent messages. We believe in:

  • Transparency

  • Evidence

  • Explain limits

  • Treat the customer like an informed adult

The water you drink every day deserves better than vague promises.

Want to know more?

If you want to delve deeper into technical data and consult the scientific studies that support our claims, you can find detailed information here:

👉 What a Stefani filter removes and what it doesn't.