Hi all, Keith,the quality is not a question,according to my NIR the BD is 99.2% esters - the foolproof method - acid stage and 2 alkaline stages with glycerin removal between ,but I am supplying a close circle of friends with fuel and the people asking me "What is that black sh.t you are producing?" Thanks,Mr Montenegro,the activated carbon is my last mean,I somehow kept the hope that I solve the problem with some bleaching agent since boiling the BD sounds no good to me/polymerization!/ and filtering is OK with 5 micron in the end of the line. Ross
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