Hi Guys- I have the itch to try RA-4 at home. I have a uicolor enlarger with filters and a uniclor processing drum. I also have a Beseler 23C set up for black and white and an Omega DII. I would like to give it a try with the unicolor....How toxic are the RA-4 chemicals compaired to the black and white print processing steps? I have a septic system here....Are there any room temperature RA-4 chemicals left?