Arsenic Filters

Yes, but only specific technologies. Arsenic-selective ion exchange resin (ResinTech ASM-10-HP), adsorptive media like the Pioneer's ATOMUS F11, and reverse osmosis all remove arsenic reliably. Ordinary carbon filters, pitcher filters, and fridge filters do not. One catch: standard resin removes arsenate (As V) only, so arsenite (As III) needs pre-oxidation or a both-forms media like the ATOMUS F11. Look for a certified claim, not a marketing one.

At well water levels there usually are none. Arsenic has no taste, smell, or color, and chronic low-level exposure produces no immediate warning signs. The health risk is long-term: elevated rates of skin, bladder, and lung cancers, cardiovascular disease, and developmental effects in children. That is exactly why a certified lab test is the only way to know; you cannot wait for a symptom.

Our whole-house arsenic systems run $1,995 to $3,495. The Pioneer cartridge system (removes both As III and As V, NSF/ANSI 53 certified) is $1,995, or $2,345 with the metered cap. The 6 GPM metered resin system is $2,695, the non-backwashing no-electricity filter is $2,895, and the 10 GPM metered system for large homes is $3,495. Budget for media: the Pioneer replacement cartridge is $895 about every 125,000 gallons and resin rebeds run $945 per cubic foot every 1 to 5 years. The $199 lab test sizes all of it.

Match the technology to the scope. For the whole house on a private well: an adsorptive or arsenic-selective ion exchange system at the point of entry, sized from your lab result. For drinking and cooking water only (small household or tight budget), a reverse osmosis system at the kitchen sink is the most effective per-gallon method. Many homes with a confirmed result run both: whole-house removal plus RO polish at the tap.

No. Boiling concentrates arsenic. Water evaporates, arsenic stays behind, so the longer you boil the higher the concentration gets. Letting water sit, freezing it, water softeners, and standard carbon filters do not remove it either. Arsenic comes out of water three proven ways: arsenic-selective ion exchange, adsorptive media, and reverse osmosis.

It depends which system you want. Standard lab panels report total arsenic; a speciation test splits that number into arsenite (As III) and arsenate (As V). If you plan to run an arsenic-selective resin system, speciation matters because resin removes As V only, and As III would need to be oxidized first by chlorination or an oxidizing filter.

If you skip speciation, the honest shortcut is the Pioneer: its ATOMUS F11 media removes both forms with no pre-oxidation, so the question stops mattering. Most US well arsenic is already As V, but 'most' is not a number; either speciate or pick the system that covers both.

Iron first, always. Iron above 0.3 ppm (or manganese above 0.05 ppm) coats arsenic media and kills its capacity. The fixed install order on a well: sediment, iron filter, acid neutralizer if pH is low, softener if hard, arsenic filter LAST, then UV if bacteria.

There is a useful bonus: Katalox Light iron filters co-precipitate trace arsenic with the iron at neutral pH. If your arsenic is barely over the limit and you have iron anyway, the iron filter sometimes finishes the whole job; a post-install retest tells you whether a dedicated arsenic stage is still needed. Send Aidan both numbers and he will sequence it for you.

It scales with your arsenic level, your daily water use, and competing ions. Under good conditions arsenic-selective resin removes 50 ppb arsenate for 500,000+ gallons per cubic foot, which works out to roughly 1 to 5 years in a real home. High pH, silica, sulfate, and phosphate all shorten that. The Pioneer cartridge is rated about 125,000 gallons, roughly 12 to 24 months of typical whole-house use.

Arsenic media is single-use: it cannot be regenerated. The metered systems count gallons so you replace on data, and an annual treated-water arsenic test (about $30 at any state-certified lab) verifies the system is still at full removal.

Reverse osmosis at the kitchen sink is the most effective per-gallon arsenic method and covers the main exposure route: drinking and cooking water. If your level is modest, your household is small, or budget is the constraint, an under-sink RO is a legitimate answer and we will tell you so.

Whole-house treatment is the right call when the level is meaningfully elevated, when kids fill cups at bathroom sinks, or when you want the problem gone everywhere including ice makers and pets' bowls. Many homes with a confirmed result run both: point-of-entry arsenic removal plus RO polish at the tap. Note that RO membranes reject As V much better than As III, one more reason speciation (or a both-forms system) matters.

No. A softener exchanges hardness minerals (calcium, magnesium) and does not touch arsenic. Standard carbon filters, pitcher filters, and fridge filters are designed for chlorine, taste, and odor; arsenic passes straight through them. Boiling makes it worse by concentrating the arsenic as water evaporates.

Arsenic comes out of water three proven ways: arsenic-selective ion exchange (As V), adsorptive media like ATOMUS F11 (both forms), and reverse osmosis at the tap. Anything else sold as an arsenic fix should show you a certified reduction claim before you believe it.

No. The arsenic is bound to the media so tightly that spent resin and cartridges pass the EPA's TCLP leachability test, which means they are classified as non-hazardous solid waste and go out with regular household trash in all 50 states. That bond is also why the media cannot be regenerated and is replaced instead.

This is a real advantage over older arsenic approaches that produced arsenic-laden backwash water or brine. Nothing in these systems discharges arsenic back into your septic, your drain field, or your yard.