Whole-Home Add-On · Arsenic Reduction · Consultation Required
Arsenic, reduced below the EPA limit.
Both forms. Every tap.
The Pioneer As is a point-of-entry add-on filter certified by WQA and IAPMO R&T to NSF/ANSI 53 for the reduction of both trivalent (As III) and pentavalent (As V) arsenic below the EPA Maximum Contaminant Level of 0.010 mg/L. It installs at the main water line as a layer within a whole-home water filtration approach — most often on well water, after a certified lab test confirms arsenic is present.
Made in the USA · Dual certified by WQA and IAPMO R&T
Certified Reduction Claims
Both arsenic forms. One certified system.
The Pioneer As is certified to NSF/ANSI 53 by WQA and IAPMO R&T for the reduction of trivalent and pentavalent arsenic from 0.050 mg/L influent to below the EPA Maximum Contaminant Level of 0.010 mg/L.
Pentavalent Arsenic (As V)
99.1%Reduced at pH 6.5 (99.0% at pH 8.5) from 0.050 mg/L influent to below 0.010 mg/L — certified to NSF/ANSI 53. As V is the most common arsenic form in oxygenated groundwater.
Trivalent Arsenic (As III)
98.3%Reduced at pH 6.5 (96.6% at pH 8.5) to below 0.010 mg/L — certified to NSF/ANSI 53. As III is the harder form to capture; many arsenic filters address only As V.
Material Safety
The ATOMUS F11 adsorptive media is certified to NSF/ANSI 61 for material safety and NSF/ANSI 372 for low-lead content — the media treating your water is itself held to drinking water standards.
pH-Dependent Performance
Reduction is strongest at lower pH: performance at pH 6.5 exceeds pH 8.5 for both forms. Water above pH 8 calls for pH adjustment, which your consultation and water test will identify.
Well Water First
Arsenic occurs naturally in groundwater and has no color, taste, or smell — the Pioneer As is primarily a well water solution, though it serves city supplies with confirmed arsenic as well.
Pre-Filtration Ready
Upstream sediment filtration of 5 microns or finer is recommended to protect the adsorptive media — a detail GoodFor's installation plan accounts for.
Arsenic reduction figures are NSF/ANSI 53 claims certified by WQA and IAPMO R&T at 0.050 mg/L ±10% influent; performance varies with pH as stated. Learn how to read certification claims on our NSF certifications guide.
How It Works
Adsorption, verified by lab testing on both ends.
The Pioneer As works by adsorption: ENPRESS ATOMUS F11 media binds arsenic as water passes through the point-of-entry housing — and because arsenic is undetectable by sight, taste, or smell, certified lab tests define both the problem and the proof.
Test First, Always
GoodFor recommends the Pioneer As only after a certified laboratory water test confirms arsenic is present. Arsenic cannot be seen, tasted, or smelled at any concentration that matters — a lab result is the only trustworthy signal, and it also determines whether your pH calls for adjustment.
ATOMUS F11 Adsorption
The F11 adsorptive media captures both As III and As V as water flows through at up to 7 GPM, rated for 125,000 gallons. Cartridge replacement takes minutes with 3 feet of overhead clearance, and follow-up testing verifies your water stays below the EPA MCL.
Specifications
The numbers behind the system.
The Pioneer As pairs certified adsorptive media with a proven point-of-entry housing, sized for residential main lines up to 1 inch.
The GoodFor Difference
A specialist system, recommended like one.
GoodFor doesn't sell arsenic filters to worried homeowners — we match them to confirmed lab results. That discipline is the difference between water treatment and water marketing.
Confirmed Before Recommended
Arsenic is invisible to every human sense, so GoodFor recommends the Pioneer As only when a certified laboratory test shows it in your water. No test result, no recommendation — that's the standard.
Both Forms, Dual Certified
Trivalent arsenic (As III) is significantly harder to remove than pentavalent (As V), and many systems only address the simpler half. The Pioneer As carries NSF/ANSI 53 certification for both, verified by WQA and IAPMO R&T independently.
Installed by Licensed Pros
Point-of-entry installation, pre-filtration, pH strategy, and grounding continuity on metal plumbing are handled by GoodFor's licensed team, led by a California Licensed Master Plumber (CSLB #1102129). Well owners: start with our well water treatment guide.
Layered With Your Primary System
The Pioneer As addresses arsenic and only arsenic — it does not soften, inhibit scale, or carry primary chlorine capacity. It installs alongside systems like the Hydronex C so every layer does its certified job.
Find Your Fit
Build the right stack around it.
The Pioneer As is a targeted layer — these are the systems it works alongside, and its lead-and-PFAS sibling.
Hydronex C
GoodFor's flagship filtration and softening system — the foundation layer for most homes, well or municipal.
View the Hydronex C →Pioneer Pb
The companion add-on: NSF/ANSI 53-certified lead (99.62%), PFOA/PFOS (97.9%), and cyst reduction.
View the Pioneer Pb →Clarius C
Whole-home chlorine and chloramine reduction with minerals preserved — a compatible primary layer.
View the Clarius C →Start With Your Water
Start with a certified water test.
If arsenic is on your mind — especially on well water — the first step is lab data, not equipment. Your free consultation walks through testing, reads your results, and matches the right layers to what they show. In person across Southern California, virtual nationwide.
Prefer to talk it through? Call (833) 488-3489 or email hello@thegoodforco.com.
Common Questions
Pioneer As questions, answered.
How do I know if I have arsenic in my water?
Only a certified laboratory test can tell you. Arsenic has no color, taste, or smell at any concentration relevant to health — it occurs naturally in groundwater, which is why well owners are the most affected group. The EPA Maximum Contaminant Level is 0.010 mg/L. GoodFor's consultation walks you through getting a proper lab test and reading the results before any system is recommended.
What's the difference between As III and As V, and why does it matter?
Pentavalent arsenic (As V, arsenate) dominates in oxygen-rich water and is readily captured by treatment media; trivalent arsenic (As III, arsenite) dominates in low-oxygen groundwater and is significantly harder to remove — many arsenic filters are only effective against As V. The Pioneer As is certified to NSF/ANSI 53 for both forms: 99.1% As V and 98.3% As III reduction at pH 6.5, both to below the EPA MCL of 0.010 mg/L.
Does water pH affect how well it works?
Yes — performance is pH-dependent. At pH 6.5 the system reduces As V by 99.1% and As III by 98.3%; at pH 8.5 those figures are 99.0% and 96.6%. Water with pH above 8 calls for pH adjustment ahead of the system for best performance, which is exactly the kind of detail your water test surfaces and your consultation plans for.
Can the Pioneer As be my only water treatment system?
It can be installed on its own when lab-confirmed arsenic is your specific, targeted concern — but it addresses arsenic and only arsenic. It does not soften water, inhibit scale, remove lead or PFAS, or provide primary chlorine and chloramine capacity. GoodFor installs it as a layer alongside a primary system such as the Hydronex C or Clarius C — with certified reverse osmosis available as an additional drinking-water layer — and with 5-micron or finer sediment pre-filtration upstream to protect the adsorptive media.
Why isn't there a price on this page?
The Pioneer As is quoted as part of a complete treatment plan built from your lab results — pre-filtration, pH strategy, and primary-system pairing all shape the final scope. Pricing is provided during a free, no-obligation consultation, in person across Southern California or virtually anywhere in the US.