Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" 
<paul.roark@...> wrote:
> The city sewer police saw my darkroom in house plans and were very 
concerned
> about the health of their sewer system.  Oddly, Microdol X was at the 
top of
> their list of bads.  Xtol was formulated, apparently, in part to 
avoid these
> problems.  The health of the sewer systems is one of its main points.
> 


At work there is a huge waste treatment processor for the photo lab. 
Two (about) 500 gallon containers, one control panel, one air 
compressor, 55 gallon drum of sulfuric acid (and no silver 
recovery???). Apparently they need to keep the discharge at around a pH 
of 7 (and whatever else the machines do).