Hey bro, there is a subforum on seed feminization in the autoflower breeding section. There is a thread in there all about maki g your own colloidal silver that will have you making your own fem beans in no time-if you follow the directions bob has posted in there. That will give you a cs spray that is proven to work. As far as the product you posted a link to, I dont know how well it works. Sorry I couldnt give you a direct answer, but ive directed you to a place where you can A) either make your own or B) easily put you into contact with a person who can answer any and all questions you have.
