Chlorine at higher than 0.6 ...

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Chlorine at higher than 0.6 ppm leaves a bad taste in the water and can develop disinfection byproducts (DBPs) if there is sufficient organics in the water (>2 ppm). Ultraviolet (UV) disinfection is an excellent alternative as efficiency continues to increase with LEDs, etc.  UV is only effective on filtered water where the UV photons can penetrate far enough to sever the DNA of the pathogens.  Filtration must provide a UV transmivity (UVT) of greater than 75% so the UV can do its job.  The contact time must be sufficient.  Combining solar power (PV) and a battery will provide the UV with power in remote areas.