"DSK" wrote in message
news
Gogarty wrote:
The Lecteasan is a good gadget, though the proliferation of no discharge
zones into the open sea increasingly threatens it. When it is operating
properly the sewage is treated to almost sterile levels and causes no
harm whatever to the environment.

That's not entirely true.

The Lectra-San kills all the bacteria. It does not reduce or break down
the material effluent, which contains nutrients and changes the local
ecological balance.

Is this "damage" to the environment? It is, if you liked what was growing
there before.

Actually, eutrification is a much greater threat than bacterial
contamination.
That is why phosphates were removed from detergents many years
ago.

DSK