AION Under Sink
Under Sink
7-Stage Filter
Point-of-Use Filtration System
$2,995
Includes first-year filter service and lifetime housing warranty
The AION Under Sink 7-Stage Filter is the most advanced point-of-use water filtration system available for residential use. Seven precision stages eliminate 100% of known contaminants — from chlorine and PFAS to pharmaceutical residues and microplastics — then remineralize at optimal pH for cellular hydration.
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$2,495
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Secure your spot today. Balance of $2,495 collected 30 days before shipment. Fully refundable until fabrication begins.
Free shipping · Self or plumber installation · Ships Summer 2026
RECOMMENDED ADD-ON
Install Kit — $249
FREE SHIPPINGEverything your plumber needs: 3.2 gallon storage tank, your choice of faucet finish, and all tubing, valves, and fittings. Installation-ready out of the box.
Filtration Architecture
Seven Stages of Elimination
5 Micron Sediment Filter
5 Micron Spun Polypropylene
The first line of defense. A tightly wound 5-micron polypropylene block captures sediment, sand, rust, silt, and suspended particulates before they reach any downstream media — protecting the RO membrane from fouling and extending the life of every stage that follows.
Activated Carbon Block
Coconut Shell Activated Carbon Block
High-density coconut shell carbon in block form delivers broad-spectrum adsorption of chlorine, chloramines, VOCs, pesticides, herbicides, taste, and odor compounds. Block construction eliminates channeling and ensures every drop of water makes full contact with the carbon media.
Catalytic Carbon Block
Centaur® Catalytic Activated Carbon
Standard carbon cannot break the chloramine bond. Catalytic carbon — engineered with a modified surface structure — catalytically destroys chloramines, PFAS precursors, and disinfection byproducts that survive conventional carbon treatment. A second carbon stage ensures belt-and-suspenders protection before water reaches the RO membrane.
High-Rejection RO Membrane
High-Rejection Thin-Film Composite RO
The core elimination stage. A high-rejection thin-film composite membrane achieves 95–99% removal of TDS, heavy metals, arsenic, fluoride, nitrates, chromium-6, pharmaceuticals, and dissolved salts. Dual carbon pretreatment protects the membrane from chlorine degradation, extending its service life significantly beyond industry norms.
Ultrapure Deionization
Mixed-Bed Nuclear-Grade Ion Exchange Resin
Mixed-bed ion exchange resin polishes water to near-ultrapure quality by capturing residual cations and anions that pass through the RO membrane. Output targets below 1–5 ppm TDS — the threshold used in laboratory, pharmaceutical, and semiconductor-grade water systems. This is the stage that separates 'very clean' from 'the world's cleanest.'
Calcite Remineralization
Natural Calcite (Omnipure Inline Cartridge)
Ultrapure water is flat, slightly acidic, and stripped of all minerals. Natural calcite media slowly dissolves into the water stream, reintroducing calcium carbonate and gently raising pH to 7.0–8.0 for balanced taste and improved cellular absorption. Early AION buyers will receive a complimentary upgrade to our custom mineral blend when it launches.
Nano Ceramic Carbon Polish
Nano-Ceramic Carbon Composite Block
The final and defining stage. A nano-ceramic carbon composite block provides sub-micron mechanical filtration combined with adsorptive carbon polishing — capturing any trace organics, particulates, or biofilm that could form downstream of the RO and DI stages. This stage is the primary reason AION outperforms filter systems that stop at RO or DI alone.
Technical Specifications
System Specifications
NSF/ANSI Certification — In Progress
AION systems are currently undergoing third-party NSF/ANSI 42, 53, 58, and 401 certification testing. Results are expected in Q3 2025. In the meantime, all performance claims are based on the certified specifications of the individual filter media used in each stage. We will update this page as certifications are issued.
HOW WE COMPARE
AION vs. The Alternatives
Most filters are certified to reduce a percentage of a contaminant under ideal laboratory conditions. AION is engineered to eliminate. The difference is not marketing — it is architecture.
| CONTAMINANT / CATEGORY | BRITA PITCHER | BERKEY SYSTEM | RORRA | AION 7-STAGE |
|---|---|---|---|---|
Chlorine & Chloramine Primary disinfectants — form carcinogenic byproducts (THMs, HAAs) | Chlorine/taste (NSF 42); chloramine not NSF-certified | Chlorine addressed via carbon; chloramine not certified | Nanofiber filter addresses chlorine (NSF 42); chloramine not certified | Dual carbon destruction — activated + catalytic carbon in series |
PFAS / Forever Chemicals Detected in 45% of U.S. tap water; linked to cancer and immune suppression | Elite filter: PFOA/PFOS only (NSF 53); Standard filter: not rated | No PFAS certification; Black Berkey off US market (EPA stop-sale 2023) | NSF 53 certified — 99.58% PFAS removal; single nanofiber filter | Catalytic carbon pre-treatment + high-rejection RO membrane |
Lead & Heavy Metals Arsenic, cadmium, mercury, chromium-6 — no safe exposure level | Lead only (NSF 53); arsenic and other metals not addressed | Lead addressed; arsenic/chromium-6 not NSF-certified | Lead NSF 53 certified; no RO or DI — other dissolved metals remain | RO + mixed-bed DI — dissolved metals captured to below 5 ppm TDS |
Fluoride Added to municipal water; accumulates in bone and pineal tissue | Does not address fluoride | Does not address fluoride (requires separate add-on purchase) | No RO membrane — fluoride passes through nanofiber filter | High-rejection RO + DI — near-complete fluoride elimination |
Nitrates & Nitrites Agricultural runoff; causes blue baby syndrome; colorectal cancer link | Not rated | No nitrate certification | No RO membrane — nitrates not addressed by nanofiber filtration | RO membrane + DI resin — ionic nitrate capture |
Pharmaceutical Residues Hormones, antibiotics, antidepressants — zero regulatory limits | Elite filter: select compounds (NSF 401); Standard: not rated | No pharmaceutical certification | NSF 401 certified — BPA, estrone, ibuprofen, naproxen; single filter | RO + DI — pharmaceutical-grade output below 5 ppm TDS |
Glyphosate & Herbicides WHO Group 2A probable carcinogen; found in 70%+ of U.S. rainfall | Not rated | Some adsorption via carbon media; no herbicide certification | No herbicide-specific NSF certification | Catalytic carbon adsorption + RO membrane rejection |
Trihalomethanes (THMs) Chlorination byproducts — IARC Group 1 carcinogens | Some THMs addressed (NSF 53); not comprehensive | Carbon media addresses THMs; not NSF-certified for this | NSF 53 certified for some THMs; single nanofiber filter | Dual carbon stages destroy THM precursors before RO |
Microplastics Found in 94% of U.S. tap water; carry absorbed toxins into tissue | Some particles captured; no microplastics certification | Addresses particles above 0.2 micron via microfiltration | NSF certified for microplastics ≥0.5µm; sub-0.5µm not certified | RO membrane + nano ceramic carbon polish — sub-micron final barrier |
Bacteria & Pathogens E. coli, giardia, cryptosporidium — gravity and pitcher filters vary widely | Not rated for microbial removal | Bacteria addressed via microfiltration; virus removal not NSF-certified | No NSF certification for bacteria or virus removal | RO + nano ceramic carbon polish — absolute final-stage barrier |
Atrazine & Pesticides Endocrine disruptors — atrazine chemically castrates frogs at 0.1 ppb | Atrazine only (NSF 53); other pesticides not addressed | Some pesticide adsorption via carbon; not certified | NSF 53 certified for some VOCs; no herbicide-specific certification | Catalytic carbon adsorption + RO rejection — dual-stage |
Dissolved Solids (TDS) Overall measure of ionic contamination load | Does not address TDS | Gravity carbon filter — minimal TDS impact | No RO membrane — TDS passes through nanofiber filter | RO + DI — output below 5 ppm, pharmaceutical grade |
Remineralization & pH Pure RO water is slightly acidic — optimal hydration requires minerals | No remineralization | No remineralization | No remineralization stage | Calcite remineralization — calcium, pH 7–8.5, natural taste |
Performance data based on NSF/ANSI certifications, manufacturer documentation, and independent laboratory testing. Brita ratings reflect the Elite filter (highest-performing current model). Berkey ratings reflect the Phoenix Gravity New Millennium Edition (current US-available model; original Black Berkey filters subject to EPA stop-sale order since 2023). Rorra ratings reflect the Rorra countertop system with Enfinity™ nanofiber filter (single-stage, gravity-fed; no RO membrane). AION ratings reflect engineered design specifications; AION is not yet NSF-certified. Competitor assessments reflect publicly available certification data; individual performance may vary by source water chemistry and maintenance schedule.
Common Questions
Frequently Asked Questions
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