I started using Noflex Digestor in my holding tank last season after reading about it here. I was very pleased with the results. My holding tank vent went from hideous to zero smell within a week or so. I just went to reorder some and found that Fisheries Supply has it on sale for $16.50 per bottle. See: https://www.fisheriessupply.com/zaal...minator-noflex

If you spend $100 or more, shipping is free.

Also, while googling to find where I wanted to buy it, I came across a review that did an experiment with the stuff. Interesting reading: http://littlecunningplan.com/2016/10...-with-science/