Bruce,
In the liquid format, I know of one product that works in salt-water environment :
From BactaPur's website:
Bacta-Pur® XLSW :To biodegrade soluble organic pollutants - BOD reduction as well as for sludge reduction in salt water (>5 ppt salinity).
These guys are manufacturer, beats me how you can manufacture bacteria!!! in fact they should be called bacteria farmers! They have a pretty cool bacteria brewing operation right here in Quebec and they ship all around the world... not today cause the bacteria would freeze
