I am far from an advocate for ...

I am far from an advocate for chlorine dioxide.  It is a toxic material, which certain companies promote its use outside its usefulness.  Its use as a disinfectant in the presence of ammonia is also a disadvantage.  Because it doesn't bind with ammonia, this becomes free to allow bacterial growth on pipe surfaces within a biofilm.  (Don't always believe what is said about the effectiveness of ClO2 and penetration of slime).  I have come across a situation where bacteria was growing in the biofilm.  When bacteria were released into the water the bacteria disintegrate in the presence of the ClO2 causing the water to have an "off odour".  ClO2 has no effect on iron bacteria which results in metallic tastes in water.  If the waters are metallic (iron) tasting, they are usually safe to drink.  If there is a mild smell or taste of drains, then this may be unsafe and water boiled.  Using filters will often remove these tastes.  It must be remembered that these filters do require changing after the recommended period.