Can anyone share their experience with RO filtration systems?
If we take a look at the literature on the subject, it shows that reverse osmosis and nanofiltration can provide satisfactory removal, but the process is very water intensive.
Ion exchangers can eliminate As(V) from the water. However, high levels of suspended solids or water that contains selenium, sulfate, nitrate, or floride can reduce resin life. Eliminating highly concentrated spent regenerants is a big problem. As(III) is hard to get rid of with an ion exchanger.
So far the best approach is with a process that combines precipitation of FeCl3 followed by adsorption.
Here is a link to a product: http://www.lenntech.com/processes/arsenic/arsenic-removal.htm