I have plenty of experience ...

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I have plenty of experience with this type of task over the past 30 years.  Removing Arsenic by RO can be done BUT is considered inefficient because both Arsenous and Arsenic acids do not readily dissociate into their respective ions unless the water is highly alkaline.  Osmosis works on dissociated salts.

There are many options for this task but for best practise the designing of an Arsenic removal process must be a holistic approach because the concentrated arsenic can be more dangerous than the low concentrations in the feed water!

The best Arsenic processes' takes into account how the concentrated Arsenic will be made safe for the environment and future generations.