beware of benzene
Just my two cents but I would stay away from anything with benzene in it. Bezene is a cancer causing substance even in small exposures let alone chronic exposure. I do not currently use the perosan but have used it in the past with great results for the beer. To handle the concentrated stuff takes great care as it is a very harsh acid/oxidizer. I currently use a 20 ppm solution of iodaphor from Enerco. I don't have a foaming problem and handling the stuff is much safer than any other sanitizers I have used, especially at working concentrations. One thing to beware of though is iodine has a strong odor and if used at too high of a concentration it can effect your flavor, aroma and head retention. That being said I've always had great luck with no adverse effects using iodine based sanitizers. Hope that helps.