7. RSSCT Adsorptive Media Compare RSSCT = Rapid Small Scale Column Testing  30-60 days test duration  Up to 5 medias / columns  Equipment available free from DES and UNH TAC  PWS collects and pays sample analyses  Daily inspection required

8. Anion Exchange  Simplest onsite regeneration  Must manage alkalinity / corrosion  Dumping happens!  No As III removal

10. Iron-Arsenic Oxidation Filtration (aka greensand)  20:1 Iron to As ratio  pH ≤7.5  Chlorine or Permanganate feed  High Backwash Rate Pyrolusite medias  Backwash filter or common septic tank

12. www.des.nh.gov  A to Z list –“A” = Arsenic drinking water page –“R” = Radon in Air page –“R” = Rads drinking water page –“S” = Small PWS Help Center –“U” = Uranium / rads page  Quick Links “Publications/Factsheets”  Cynthia.Klevens@des.nh.gov, 271-3108 Cynthia.Klevens@des.nh.gov