Hello all- I live in a somewhat rural area, near a river, and have a septic tank. I am concerned about releasing chemicals into the environment. I have traditionally been a Kodak guy, using D-76, Dektol, and the standard Kodak fixer. (I have used Rodinal as well, but really prefer D-76). I see a line of chemicals marketed by Silvergrain which claims that they are "eco-friendly." (their words, not mine). Has anyone used them? Any thoughts?