Water Filtration Media Types, Uses & How to Choose
Filtration media is the granular material — carbon, oxidizing sand, alumina, resin or mineral — that sits inside a vessel and pulls a specific contaminant out of the water passing through it. No single medium removes everything; you match the medium to the problem. Here’s how to choose, and the media families ERE supplies.
How to choose the right media
What’s in the water?
Start from a lab analysis — target the actual contaminant, not a guess. Chlorine and taste point to carbon; iron and manganese to an oxidizing media; fluoride and arsenic to activated alumina; hardness to ion-exchange resin.
What flow and vessel?
Media is sized to your service flow rate and bed depth. Get this wrong and the medium channels or under-performs. Send us your flow and vessel and we’ll size it.
One problem or several?
One contaminant = one medium. Several = a multimedia bed or media in series — for example anthracite over a finer medium, or carbon after an oxidizing stage.
What each medium removes
Six families cover almost every water-treatment job. Tap through to the product for full specs, datasheets and a quote.
Activated carbon (GAC & catalytic)
Removes: chlorine, chloramine, taste & odour, hydrogen sulfide (catalytic grade), organics / VOCs.
Use for: dechlorination ahead of RO or resin, taste polishing. Catalytic carbon is the grade for chloramine and sulfur odour.
Oxidizing iron & manganese media
Removes: dissolved iron, manganese, and (Filox) hydrogen sulfide — the well-water trio.
Use for: rusty/staining water, black manganese staining, sulfur smell. Greensand needs permanganate regen; Birm is low-maintenance; Filox is high-capacity catalytic.
Activated alumina (fluoride & arsenic)
Removes: fluoride, arsenic (As III/V with pretreatment), some selenium.
Use for: drinking-water compliance where fluoride or arsenic exceeds limits. Performance is pH-sensitive; sizing matters.
KDF media (heavy metals & bacteriostatic)
Removes: chlorine, lead, mercury, hydrogen sulfide; inhibits bacteria and scale in the bed.
Use for: a carbon companion to extend carbon life, control microbial growth, and pull dissolved heavy metals at point-of-entry.
Ion-exchange resins (softening & demin)
Removes: hardness (cation), nitrate/sulfate/anions (anion), full demineralization (mixed bed).
Use for: softening to protect equipment; low-conductivity lab/process water; targeted anion removal.
Mineral & multimedia (anthracite, zeolite)
Removes: suspended solids, turbidity, sediment; zeolite also reduces ammonia and some metals.
Use for: the layers of a dual-/multimedia bed (coarse anthracite over finer garnet/sand) for longer runs, or standalone sediment reduction.
Media × target contaminant × use
| Media family | Primary target | Typical use / stage | Product |
|---|---|---|---|
| Activated carbon (GAC / catalytic) | Chlorine, chloramine, taste/odour, H₂S, VOCs | Dechlorination, taste polishing, pre-RO | Carbon Media |
| Greensand Plus | Iron, manganese | Well-water oxidation (permanganate regen) | Greensand Plus |
| Birm | Iron, manganese | Low-maintenance oxidation (dissolved O₂) | Birm |
| Filox | Iron, manganese, hydrogen sulfide | High-capacity catalytic oxidation | Filox |
| Activated alumina | Fluoride, arsenic | Drinking-water compliance | Alumina |
| KDF | Lead, mercury, chlorine, H₂S; bacteriostatic | Carbon companion, POE pre-filtration | Watts® KDF |
| Cation resin | Hardness (Ca/Mg) | Softening | Cation Resin |
| Anion resin | Nitrate, sulfate, anions | Targeted anion removal | Anion Resin |
| Mixed bed resin | Full demineralization | Lab / process low-conductivity water | Mixed Bed |
| Anthracite / zeolite | Suspended solids, turbidity, ammonia | Multimedia top layer / sediment | Anthracite |
Match the medium to the problem
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Iron / manganese / sulfur (well water): Birm (low maintenance) or Greensand Plus; step up to Filox for heavy loads or H₂S.
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Chlorine, taste, odour, organics: GAC — choose catalytic carbon for chloramine and sulfur odour.
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Fluoride / arsenic compliance: Activated alumina, sized to flow and pH.
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Hardness / scale: Cation softening resin; mixed bed for demineralized lab water.
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Sediment / turbidity: Anthracite, often layered over finer garnet or sand.
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Heavy metals + carbon-life: A KDF stage ahead of or alongside carbon.
Spec your media with ERE.
Supplying environmental and water-treatment equipment since 1994 — sales, rentals, repair & calibration, coast to coast, bilingual. Send your water analysis and flow rate; we’ll recommend the right media, grade and vessel.
Request a Quote 1-888-287-3732Media selection FAQ
Start with a water analysis. The contaminant dictates the medium — carbon for chlorine and taste, an oxidizing media (greensand, Birm, Filox) for iron and manganese, activated alumina for fluoride or arsenic, ion-exchange resin for hardness. Send us the analysis and we’ll match it.