I always read with attention you post and I have learned a lot from youi;
but this time I can't agree with you.
just curious... Do you like to swim in your s**t?

Every sewage treatment plant in the world discharges into somebody's
waters...so it's just a matter of how well treated you want it to be.

I don't speak about what is legal.
I express my PERSONAL opinion about what is correct.
My personal opinion is that is uncorrect to dump anything in coastal waters,
also soapy water...

Please discarge your waste few miles away from coast... where currents and
large wather masses can dilute and dissolve it.
Or dump it at marina, where it will be sent to a serious (i hope...)
treatment plant...
If it isn't clear, drinkable water don't dump it in costal waters please.

And fwiw, the negative impact from just ONE dumped holding tank is
greater on the surrounding waters than that from 1000 boats, all using
Lectra/Sans, in the same waters for 24 hours.

I have read the lectra/sans manual.
I am not a specialist, like you, but, if memory helps, salty water
electrolisys produces clorine... (I am right?) this means that the s**t is
macerated and disinfected... But it remains s**t, nice dark s**t.
Maybe that is legal and safe, but is s**t. You would like it in your
swimming pool? No? don't dump it in our swimming pool, please.

This is ONLY MY PERSONAL OPINION.

I will continue to read your posts with greatest consideration.

Paolo