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The only problem with excrement hitting the marine environment is if it accumulates on the shore or causes unpleasant odors to humans.

Remember that the ocean is a soup of all of its inhabitants' excretions and decaying corpses, and happily consumes stuff like that. Ocean life thrives around raw sewage pipe outlets.

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The only problem with lots of excrements being regularly trow to water courses in a single point without treatment is that is illegal in EU.

Recently Brussels fined Spain €12 million for failing to treat urban waste water in nine points of the coast. The idea of dutch floating farms being allowed at the same time to throw faeces and enteric bacteria directly to a populated port in the heart of the EU would be, obviously, very difficult to explain to the public opinion.

And I'm not even mentioning the powerful mussel's farm industry in Holland. They would be extremely upset.

This is exactly wrong - sewage is far too concentrated, and there is a long history of slowly cleaning up raw sewage outflows in the EU. There's no way you'd be allowed to dump a dairy farm's effluent directly into the sea.

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