Agreed.As far as I’m concerned a Retort is the only way. The other methods are not remotely good as a Retort.
I've done this once or twice; very good. Not bleach - Chlorine Dioxide water purification treatmentsI'm a fan of the least intrusive method first, then moving up to harsher ones only if needed. Chlorine is something I've never needed on estates.
How often have you done that?