The toxin only way that the toxin can be removed is trough reverse osmosis and then charcoal filtering. Many water treatment plants the treatment consist of mixing the contaminated water with uncontaminated water until it reaches a level below the approved threshold.
Wouldn’t the chlorine oxidize the toxin or would an even stronger oxidizer be required like hydrogen peroxide or ozone? Are the toxin molecules small enough to pass through RO membranes?