What’s Actually in Your Tap Water? How the Santevia Gravity Fluoride Filter Addresses 8 Contaminant Categories

Most people know their tap water contains chlorine. Fewer realize it may also contain fluoride, lead, microplastics, pharmaceutical residues, herbicides, and volatile organic compounds — often simultaneously, at levels that vary significantly by municipality and season.

The Santevia Gravity Water System Fluoride Filter is a 6-stage replacement cartridge designed to address all of these categories in a single filter — while adding the minerals your body needs and naturally raising your water’s pH to alkaline levels. Here’s a contaminant-by-contaminant breakdown of what it does and why each stage matters.

Why 6 Stages? The Case for Multi-Stage Filtration

No single filtration medium removes all contaminants. Activated carbon excels at chlorine and organic compounds but can’t remove fluoride or heavy metals effectively. Ion-exchange resin handles heavy metals and pharmaceuticals but doesn’t address chlorine or sediment. Ceramic filtration blocks physical particles but doesn’t touch dissolved chemicals.

Multi-stage filtration works because each stage is optimized for a specific contaminant category. The Santevia Gravity Fluoride Filter uses six distinct stages — each targeting what the previous stage can’t — to deliver the broadest possible contaminant coverage from a single replacement cartridge.

Combined with the Gravity System’s extended contact time (water moves slowly through each stage rather than rushing through a compact block), the result is measurably deeper purification than any single-stage or dual-stage filter can achieve.

The 8 Contaminant Categories — and How Each Stage Addresses Them

1. Fluoride — Up to 98% Removal (Stage 3)

Fluoride has been added to municipal water supplies across North America since the 1940s. While originally introduced to support dental health, growing research has raised questions about long-term exposure, with some studies linking elevated fluoride intake to thyroid disruption and neurological effects — particularly in children.

The Gravity Fluoride Filter’s dedicated Stage 3 uses specialized adsorption media to achieve up to 98% fluoride removal. This level of performance requires both a dedicated stage and extended contact time — which is why standard pitcher filters, which rush water through a single carbon block, typically cannot claim meaningful fluoride reduction.

2. Chlorine & Chloramines — 99% Removal (Stage 2)

Chlorine is the most common tap water disinfectant in North America. It’s effective at killing pathogens in the distribution system, but it’s also responsible for the familiar “pool water” taste and odor that makes tap water unpleasant to drink. Many municipalities have shifted to chloramines — a chlorine-ammonia compound — which is more stable over long distribution distances but harder to remove.

Stage 2 granulated activated carbon (GAC) reduces both chlorine and chloramines by 99%, dramatically improving taste and odor from the first pour.

3. Lead — Heavy Metal Removal (Stage 4)

Lead contamination in drinking water is primarily a plumbing problem, not a source water problem. Lead leaches into water from aging pipes, solder joints, and brass fixtures — meaning even water that leaves the treatment plant clean can pick up lead on its way to your tap. This is particularly common in homes built before 1986, when lead solder was still widely used.

Stage 4 ion-exchange resin removes lead by swapping lead ions for harmless ones. This is the only stage that effectively addresses dissolved heavy metals — activated carbon alone cannot remove lead at meaningful levels.

4. Cadmium — Heavy Metal Removal (Stage 4)

Cadmium is a carcinogenic heavy metal that enters water supplies through industrial discharge, fertilizer runoff, and corroding galvanized pipes. Long-term exposure is linked to kidney damage and bone disease. Like lead, cadmium is addressed by the Stage 4 ion-exchange resin.

5. Microplastics — Physical Removal (Stage 1)

Microplastics — plastic particles smaller than 5mm — have been detected in tap water supplies across North America and Europe. They enter water systems through the breakdown of larger plastic waste, synthetic textiles, and plastic packaging. Research into the long-term health effects of microplastic ingestion is ongoing, but the precautionary case for removal is strong.

Stage 1 is a ceramic pre-filter that physically blocks particles as small as 0.9 microns — well within the size range of microplastic particles. This is a stage that standard pitcher filters don’t include, making the Gravity System one of the few countertop options that addresses microplastics directly.

6. Herbicides & Pesticides — Agricultural Contaminant Reduction (Stage 2)

Agricultural runoff is one of the most significant sources of organic contaminant loading in municipal water supplies, particularly in farming regions. Herbicides like atrazine and pesticides like glyphosate can pass through standard water treatment and appear in finished tap water at detectable levels.

Stage 2 activated carbon adsorbs these organic compounds during the extended gravity contact time. The slow flow rate of the Gravity System gives the carbon significantly more time to interact with these contaminants than rapid-flow pitcher filters allow.

7. Pharmaceutical Residues — Emerging Contaminant Reduction (Stage 4)

Pharmaceutical contamination in tap water is an emerging and underreported issue. Trace amounts of antibiotics, hormones, antidepressants, and other medications enter water supplies through human excretion and improper disposal. Standard water treatment is not designed to remove pharmaceuticals, and most pitcher filters don’t address them.

Stage 4 ion-exchange resin reduces pharmaceutical residues alongside heavy metals — making this one of the few countertop filter replacements that explicitly addresses this contaminant category.

8. VOCs (Volatile Organic Compounds) — Organic Reduction (Stage 2)

VOCs are a broad category of carbon-based chemicals that vaporize at room temperature. In drinking water, they typically originate from industrial solvents, fuel spills, and disinfection byproducts. Long-term exposure to certain VOCs is linked to liver damage, kidney damage, and increased cancer risk.

Stage 2 activated carbon adsorbs VOCs during the extended gravity contact time, providing a level of organic compound reduction that rapid-flow filters cannot match.

What the Filter Adds: Minerals & Alkaline pH

After removing contaminants across six stages, the filter doesn’t deliver stripped, flat-tasting water — it rebuilds your water’s mineral profile:

• Calcium — bone density, muscle function, nerve signaling
• Magnesium — energy metabolism, electrolyte balance, cardiovascular health
• Potassium — fluid regulation, heart function, blood pressure
• Trace minerals — overall mineral balance and improved water taste
• Alkaline pH — naturally elevated through mineral chemistry, no electricity required

Filter Lifespan & Replacement Schedule

The Santevia Gravity Fluoride Filter lasts 4 months or 1,200 liters (317 gallons), whichever comes first. For a two-person household drinking 4L per day, that’s approximately one replacement every 4 months — twice the lifespan of most standard pitcher filter cartridges.

Replacing on schedule is critical for fluoride removal performance. As the specialized Stage 3 media becomes saturated, fluoride reduction efficiency decreases. A fresh cartridge every 4 months ensures you’re always drinking at the filter’s rated 98% fluoride removal performance.

Frequently Asked Questions

How does the Gravity Fluoride Filter achieve 98% fluoride removal when pitcher filters can’t?

Two reasons: a dedicated Stage 3 fluoride-reduction media, and extended contact time. Standard pitcher filters rush water through a single carbon block in seconds — not enough time for meaningful fluoride adsorption. The Gravity System’s slow gravity flow gives Stage 3 the contact time it needs to achieve up to 98% fluoride removal.

How often should I replace the Gravity Fluoride Filter?

Every 4 months or after filtering 1,200 liters (317 gallons), whichever comes first. For a two-person household drinking 4L per day, this is approximately one replacement every 4 months.

Does this filter work with all Santevia Gravity Water Systems?

Yes — it’s compatible with Santevia Gravity Water System countertop and dispenser models. It is not compatible with the Santevia MINA Pitcher or other Santevia product lines.

What’s the difference between this filter and the standard Gravity System filter?

The standard Gravity System filter uses 5 stages (ceramic, activated carbon, ion exchange, mineral stones, pH enhancement). This fluoride filter adds a dedicated Stage 3 fluoride-reduction media, bringing the total to 6 stages and adding up to 98% fluoride removal. If your household is on fluoridated municipal water, this is the recommended replacement cartridge.

Does the filter remove pharmaceuticals?

Yes. Stage 4 ion-exchange resin reduces pharmaceutical residues alongside heavy metals. This is one of the few countertop filter replacements that explicitly addresses pharmaceutical contamination in tap water.

Where is the Santevia Gravity Fluoride Filter made?

Manufactured in Vancouver, British Columbia, Canada.

Ready to Replace Your Filter?

If you own a Santevia Gravity Water System and you’re on a fluoridated municipal water supply, the Fluoride Filter is the recommended replacement cartridge. Six stages, 8 contaminant categories addressed, 4-month lifespan, and mineral-rich alkaline water at every pour.

Shop the Santevia Gravity Water System Fluoride Filter on Get Ultimate Now and keep your Gravity System performing at its best.