Why Filtered Water Still Needs Minerals: The Science Behind Santevia Mineral Stones

There’s a paradox at the heart of water filtration: the better your filter removes contaminants, the more it also removes the beneficial minerals that make water taste great and support your health.

Activated carbon, ceramic filtration, and ion-exchange resin are highly effective at reducing chlorine, lead, fluoride, and other contaminants. But they don’t discriminate between harmful dissolved substances and beneficial ones. Calcium, magnesium, potassium, and phosphorus — the minerals that give natural spring water its characteristic smooth taste and health benefits — are reduced or eliminated alongside the contaminants you actually want removed.

The result is water that’s clean but flat. Purified but mineral-poor. Safe to drink but missing something.

Santevia Mineral Stones are the solution to this problem. As the 7th and final stage of the Santevia Gravity Water System, they restore the minerals that filtration removes — naturally, passively, and continuously — producing water with the mineral profile and taste of premium natural spring water.

The Mineral Stripping Problem: What Filtration Takes Out

To understand why remineralization matters, it helps to understand what filtration actually does to water’s mineral content.

Natural tap water contains dissolved minerals — primarily calcium and magnesium — that it picks up as it moves through rock and soil. These minerals are not contaminants. They’re the same minerals found in premium bottled spring water, and they contribute to both water taste and human health. The World Health Organization has noted that drinking water low in calcium and magnesium may be associated with increased risk of cardiovascular disease, hypertension, and other health conditions.

When water passes through a multi-stage gravity filter:

• The ceramic pre-filter removes sediment and bacteria
• Activated carbon removes chlorine, organic compounds, and some heavy metals
• Ion-exchange resin removes lead, cadmium, and other dissolved metals
• Fluoride reduction media (in the Fluoride Filter) removes fluoride

Each of these stages does its job well. But the cumulative effect is water that has been significantly demineralized — cleaner than tap water, but also lower in the calcium and magnesium that make natural spring water nutritionally valuable and pleasant to drink.

Remineralization is the step that closes this gap.

What Are Maifan Stones?

Maifan stone (also written as 麦饰石 in Chinese) is a naturally occurring mineral-rich rock that has been used in traditional East Asian water treatment for centuries. It’s composed of a complex matrix of silica, calcium, magnesium, potassium, phosphorus, iron, and trace elements — essentially a concentrated natural mineral source in solid form.

When water contacts maifan stone, a slow ion-exchange process occurs: mineral ions from the stone surface dissolve into the water, gradually enriching it with the same minerals found in natural spring water. This process is:

• Passive — no electricity, no pumps, no moving parts
• Continuous — mineral release occurs whenever water is in contact with the stones
• Gradual — mineral concentrations build naturally over the contact time water spends in the lower reservoir
• Long-lasting — the stones’ mineral release capacity supports a 2-year service life

Maifan stone also has mild adsorptive properties — the stone surface can bind residual organic compounds, contributing to improved water taste beyond the mineral addition alone.

What Are Bio-Ceramic Energy Balls?

Bio-ceramic balls are manufactured from a blend of natural minerals — including tourmaline, zeolite, and other mineral compounds — fired at high temperature to create a dense, stable ceramic matrix. They work alongside maifan stones in the Gravity System’s lower reservoir through two mechanisms:

Far-Infrared Emission

Bio-ceramic materials emit far-infrared radiation at wavelengths (4–14 μm) that interact with water molecules. This interaction is thought to reduce the size of water molecule clusters, potentially improving the water’s ability to carry dissolved minerals and enhancing cellular absorption. While research in this area is ongoing, far-infrared ceramic materials have been used in water treatment applications across Asia for decades.

Mineral Contribution & pH Maintenance

Bio-ceramic balls release alkaline mineral ions into water, contributing additional trace minerals and helping maintain an alkaline pH. This is particularly important in the lower reservoir, where purified water — which tends toward neutral or slightly acidic pH — can gradually become more acidic over time without a mineral buffer. The bio-ceramic balls provide that buffer, keeping your water alkaline between filter passes.

The Minerals Santevia Stones Add — and Why Each Matters

Calcium

Calcium is the most abundant mineral in the human body, with 99% stored in bones and teeth. Dietary calcium supports bone density, muscle contraction, nerve signaling, and blood clotting. Most North American adults consume less calcium than recommended — mineral-rich water provides a meaningful supplementary source that requires no additional supplementation.

Magnesium

Magnesium is involved in over 300 enzymatic reactions in the human body, including energy production (ATP synthesis), protein synthesis, muscle and nerve function, and blood glucose regulation. Magnesium deficiency is one of the most common nutritional shortfalls in North America, with studies suggesting that up to 50% of Americans consume less than the recommended daily amount. Drinking mineral-rich water is one of the most bioavailable ways to supplement magnesium intake.

Phosphorus

Phosphorus works alongside calcium to build and maintain bone and tooth structure. It’s also essential for energy production (as a component of ATP, the body’s primary energy currency) and cell membrane integrity. Most people get adequate phosphorus from food, but its presence in mineral water contributes to the overall mineral balance that makes spring water nutritionally distinct from purified water.

Potassium

Potassium regulates fluid balance, supports heart function, and helps maintain healthy blood pressure. It works in concert with sodium to control cellular fluid levels — adequate potassium intake is associated with reduced risk of hypertension and stroke.

Trace Minerals

Beyond the four primary minerals, maifan stones and bio-ceramic balls release a range of trace elements — iron, silica, zinc, and others — that contribute to the complex mineral profile of natural spring water. These trace minerals improve water taste and contribute to overall mineral balance.

The Mountain Spring Water Analogy

Natural mountain spring water acquires its mineral content through a process that takes years: precipitation filters through soil and rock, slowly dissolving minerals as it moves through geological formations before emerging as a spring. The mineral profile of the resulting water — calcium, magnesium, potassium, trace elements, alkaline pH — is the product of extended contact time between water and mineral-rich rock.

Santevia Mineral Stones replicate this process in miniature. Filtered water sits in contact with maifan stones and bio-ceramic balls in the lower reservoir, gradually absorbing minerals and raising pH — the same fundamental process, compressed into hours rather than years. The result is water with a mineral profile and taste comparable to premium natural spring water, produced at home, on demand, without plastic bottles.

Replacement Schedule: 2 Years

Santevia Mineral Stones have a 2-year service life — the longest replacement interval of any Gravity Water System component. For context:

• Ceramic pre-filter: cleaned regularly, replaced periodically
• 5-Stage or Fluoride Filter cartridge: every 4–6 months
• Mineral Stones: every 2 years

Over time, the stones’ mineral release rate gradually decreases as the surface becomes depleted. Replacement at the 2-year mark ensures consistent mineral output and alkaline pH maintenance. The stones don’t “fail” suddenly — they gradually become less effective, so timely replacement is the key to maintaining the full mineral benefit.

Frequently Asked Questions

Do Santevia Mineral Stones filter contaminants?

No. Mineral Stones are a remineralization stage, not a filtration stage. Contaminant removal is handled by the Gravity System’s filter cartridge (5-Stage or Fluoride Filter) and ceramic pre-filter. Mineral Stones add minerals and maintain alkaline pH after filtration — they are the final stage that completes the water quality picture.

What minerals do Santevia Mineral Stones add?

Calcium, magnesium, phosphorus, potassium, and trace minerals — released through a natural ion-exchange process as water contacts the maifan stone and bio-ceramic ball surfaces.

How long do Santevia Mineral Stones last?

Up to 2 years — the longest replacement interval of any Gravity Water System component. Replace at the 2-year mark to maintain consistent mineral output and alkaline pH.

Are Mineral Stones compatible with all Santevia Gravity Water Systems?

Yes — compatible with Santevia Gravity Water System countertop and dispenser models. Not compatible with the Santevia MINA Pitcher or other Santevia product lines.

Why does purified water need remineralization?

Filtration removes contaminants but also reduces the dissolved minerals that give natural spring water its smooth taste and health benefits. Purified water without remineralization is flat-tasting and lacks the calcium and magnesium your body uses for bone density, muscle function, and electrolyte balance. Mineral Stones restore these minerals naturally.

Where are Santevia Mineral Stones made?

Manufactured in Vancouver, British Columbia, Canada.

Complete Your Gravity System

If you own a Santevia Gravity Water System, Mineral Stones are the component that transforms clean filtered water into genuinely mineral-rich, alkaline water. Without them, you’re getting the filtration benefit without the remineralization benefit — clean water, but not complete water.

Shop Santevia Mineral Stones on Get Ultimate Now and complete your Gravity Water System’s 7-stage filtration process.