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Choices for Arsenic Reduction and Removal

What is Arsenic?
Arsenic is a naturally occurring element found in rock and soil which can also seep into the water supply from use in certain industries or agriculture. Arsenic can be combined with other elements to form chemicals that can be used to preserve wood, to kill insects on cotton and other agricultural crops.
Types of Arsenic
 Arsenic, “As”, usually exists in two forms, or valences, Arsenic (III) and Arsenic (V)
Arsenic (V) can be found in water supplies with a higher dissolved oxygen content and in water wells that are considered shallow. Arsenic (III) is usually found in deeper wells, with a lower dissolved oxygen content.
Arsenic (III) has a neutral charge and Arsenic (V) has a negative charge.
When treating Arsenic in household water it is important to identify the type of Arsenic in your water supply. Local water testing labs can perform an Arsenic speciation test; this will tell you how much of the Arsenic is in the (III) or (V) form. The test results will help you choose the proper Arsenic filtration/removal/reduction system for your home.
Treating Arsenic
  • Reverse osmosis for point of use removal, works very well on Arsenic (V), not affective on Arsenic (III)
  • Anion exchange units will work well on Arsenic (V) But will not remove Arsenic (III)
  • Anion Hybrid Resins Works well on Arsenic (V) and will remove a high amount of Arsenic (III)  do to the fact the resin has been impregnated with Iron Oxide that attracts the neutrally charged Arsenic (III)
  • Granular Ferric Oxide Media works well on both species of arsenic using Adsorption and the ferric oxide also attracts the Arsenic (III)
  • Titanium Based Media this also is a choice for both forms of Arsenic and is a product using adsorption to reduce Arsenic.

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