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.
Plattsburgh Brewing Co.