real sewage is not 'gone': remember all the drugs and pharmaceuticals that are emptied on a daily basis.
I thought it was all very neat and practical, but never wondered if simpler chemicals such as drugs would pass through. Maybe they're diluted enough not to be an issue? As the article notes, we're already purifying sewage from cities upstream.
Pretty amazing when he invites the host to drink from a bottle of that filth at the end.
The standard scientific (chemical) process is the mechanical separation and dilution mentioned, but there is no evidence that there is a safe level of hormone that can be absorbed daily. Not unlike DDT: actually hormones were cited as evidence during the fight for the ban. However, there is scientific evidence of sexual mutation in creatures living in water (frogs, fish etc. -- though many other things could be blamed for this, but none rule out the above)
If a virus will find way to bypass all filters and return back to human body, then we will have huge problem.