The BIO-UV is made in France.
The old type quartz tubes could not be used for high flow rates so a new style germicidal "hard tube" was made for these high intensity hard quartz lamps combined with a large 153mm stainless steel reflective chamber 
 

This UV is able to handle a pumping rate of 8,000 gallons/hr, and is ideal for some of the filter systems used in the US.
An article on the UV1 appeared in the "Koi Carp" magazine in May 2003, and this gives a long list of bacteria, mold spores, viruses, etc that it is said these units can deal with.

Water clarity is important for these UV's to destroy the micro organisms. These units will not totally sterilize the pond as it can only deal with the water passing through the unit.