Arsenic Water Filter System | Whole House

Item Number: ICS-A


Whole House Water Filter System For:

  • Arsenic Reduction
  • Both Arsenite (As+3) and Arsenate (As+5)

Recommend following with either an ICS-ST or ICS-STP

Includes First Cartridge Filter Kit (a $497 value)

Satisfaction Guarantee;   See all products

See Filter Replacement Kit

Reduces water issues:

  • Arsenic in Water

Recommended Uses:

  • Cabin/Vacation Home
  • Whole House
Or order by phone: 509-674-4000

Product Description

The Cascadian ICS-A Arsenic Water Filter System removes arsenic from your water.

Smaller size, lower cost and simpler to maintain compared to traditional arsenic treatment systems.

Works over a wide pH range.

Removes both trivalent and pentavalent forms of arsenic without having to oxidize the trivalent.

No salt or power required.

Produces no wastewater.

Includes drain on filter housing for clean no spill easy filter changes.

Required 6 GPM flow restrictor is included.

Additional information

Weight 20 lbs
Dimensions 31 × 9 × 9 in

ICS-A; Arsenic Filter System

Dimensions: 29″ x 7.5″ x 8″ (Height x Width x Depth)
Connection Diameter:
System Drain: 1/2″
Max. Capacity: 1,890,000 ppb As3 and As5 or 12 Months
Max. Flow: 6 gpm (flow restrictor is provided and required)
Min. Pressure: 25 psi
Max. Pressure:
120 psi
Min. Temperature: 39° F
Max. Temperature: 113° F
Number of Filters: 1
Weight: 20 pounds dry
Includes Filter Housing Drain
Other: Recommend following with ICS-ST or ICS-STP

Download and Print Specifications


  1. System includes an inline flow limiter designed to limit flow to 6 gallons per minute
  2. Treatment Flow Rate must not exceed 6 gallons per minute.
  3. A 6 gpm flow restrictor is required.


Click / Press Here to View Installation Instructions

Raw Water Parameters / Conditions for Operation

Bacteria: None Allowed
Chlorine: NA
Colloidal Iron: NA
Hardness: NA
Hydrocarbons, oils, or lubricants: None Allowed
Hydrogen Sulfide: None Allowed (use ICS-H to remove)
Iron & Manganese (Clear Only): None Allowed
Iron & Manganese (Colored):  None Allowed
Iron Bacteria: None Allowed (use ICS-IB to remove)
Organic Iron: None Allowed
Between 5.0 and 9.0
Sediment: NA
Silica: NA
Tannin / Organics: None Allowed
Turbidity: Less than 1 NTU

Notes for all ICS systems:

  • If Raw Water Parameter Condition for Operation = “NA” the systems will not affect and is not affected by concentrations of that parameter typically found in drinking water
  • If Raw Water Parameter Condition for Operation = “None Allowed” Remove through adequate pre-treatment
  • If Raw Water Parameter Condition for Operation = “Not for extreme levels” The cartridge useful life may be shortened and require more frequent replacement.
  • Extreme levels of any parameter may shorten useful cartridge life
  • Stated “Max Capacity” may be reduced by overall raw water chemistry
ICS-A Flow vs. Pressure Chart

Complete Treatment with the ICS-A Arsenic Filter is a simple single step process.

Arsenic filters are designed to remove arsenic in the forms As3 and As5 over a wide pH range down to 10 ppb or less. No need to chlorinate and dechlorinate or adjust pH to get maximum capacity from the filter. Be sure to have your water tested so you know what is in it and treat for any of the water quality parameters not allowed.

Note: Our testing lab is not a certified lab, all tests we do are courtesy tests only. For this reason, we do not test for anything health related including arsenic and bacteria.

It is recommended an activated carbon filter such as ICS-ST or ICS-STP be used to improve taste and odor. It is also recommended a second arsenic filter be installed after the first to provide added protection against the first reaching capacity prior to being replaced.

For assistance with your treatment system please contact us and we will be happy to help. Maximum service life is 1,890,000 ppb As3 and As5 or 1 year and may be less depending on your water quality and the volume of water treated. You must periodically test your treated water for arsenic and change filters immediately if arsenic in treated water is greater than 10 ppb.

6 gpm (flow restrictor is provided and required)

How to change your filter cartridge


How to find your system model number

"After drilling a new well for our retirement home on Whidbey Island, the water quality report tested positive for Arsenic at 0.026 mg/L. After installing a Cascadian Water ICS-A Arsenic filter system, the measureable amount dropped .018 mg/L to just 0.008, well below the state/EPA maximum concentration level. In addition to a taste and odor filter, our domestic water is now safe and enjoyable to drink.  Chris & Susan Geiger - Coupeville, WA"

~ Chris & Susan Greiger – Coupeville, WA

“Just wanted to email you some results from a customer that had the state do water analysis for them before and after the ICS-A…. They are extremely happy.”  Note: Using our ICS-A the customer was able to reduce their arsenic level from 18 ppb to 1 ppb.

~ Kevin O’dell – S.J. Perry Co. Inc. Distributor – Helena, MT.

O3 Water Systems, Inc.
“Limited” CASCADIAN® Integrated Cartridge Solutions

Water Treatment System Warranty

During the time periods and subject to the conditions hereinafter set forth, O3 WATER SYSTEMS, will repair or replace to the original user or consumer, any portion of your new ICS (Integrated Cartridge Solutions) system which proves defective due to defective materials or workmanship of O3WS. Warranty period is 10 years from date of installation. At all times O3WS shall have and possess the sole right and option to determine whether to repair or replace defective equipment, parts, or components. Damage due to conditions beyond the control of O3WS is NOT COVERED BY THIS WARRANTY.

LABOR, ETC., COSTS: O3WS shall IN NO EVENT be liable for cost of removal, installation, transportation, or any other charges which may arise in connection with a Limited Warranty claim.

THIS WARRANTY WILL NOT APPLY: (a) To defects or malfunctions resulting from failure to properly install, operate or maintain the unit in accordance with good trade practices of professionals; (b) to products which are not installed in accordance with applicable local codes and ordinances (c) to products modified at any place other than the point of original manufacture (d) to products moved from the original installation location; (e) to normal maintenance services and parts used in connection with such service; (f) to failures resulting from the abuse, physical damage, fire, freezing, acts of god, accident or negligence; (g) to products used for purposes other than for what they were designed and manufactured, and (h) cartridge filters and replacement kits.

RETURN OF REPLACED COMPONENTS: To obtain specific performance under this Limited Warranty, the defective product must be returned freight prepaid to O3WS in Cle Elum Washington or other such place as O3WS may designate together with proof of purchase, installation date, failure date, and supporting technical data.

PRODUCT IMPROVEMENTS: O3WS reserves the right to change or improve its products or any portions thereof without being obliged to provide such change or improvement of units sold and/or shipped prior to such change or improvement.

WARRANTY EXCLUSIONS: As to any specific O3WS product, after the expiration of the time period of the warranty applicable thereto as set forth under the heading “Warranty Periods” above. Cosmetic damage that does not affect the process functionality of the equipment is not covered. O3WS Industries makes every effort to ensure that all illustrations and specifications are correct. However, these do not imply a warranty that the product is merchantable or fit for a particular purpose, or that the product may not vary from the illustrations and specifications. THERE ARE NO EXPRESS OR IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, WHICH EXTENDS BEYOND THOSE WARRANTIES DESCRIBED OR REFERRED TO ABOVE.


Some jurisdictions do not allow the exclusion or limitation of incidental or consequential damages and some jurisdictions do not allow limitations on how long implied warranties may last. Therefore, the above limitations or exclusions may not apply to you. This Limited Warranty gives you specific legal rights and you may also have other rights which vary from jurisdiction to jurisdiction.

For your warranty protection (Magnason-Moss Warranty Act) the WARRANTY REGISTRATION CARD MUST BE COMPLETED AND RETURNED TO O3WS WITHIN TEN (10) DAYS OF INSTALLATION. In the absence or other suitable proof of installation date, the effective date of this warranty will be based upon the date of manufacture plus thirty (30) days. Direct all notices, etc. To: Service Department, O3 Water Systems, Inc., 5301 Airport Rd, Cle Elum WA, 98922