I just like to use and recommend cheato because well, you should only have to buy it once. If you need a quickfix (don't know why you would) then ferric oxide is great, but I would prefer to spend 10 bucks on cheato and just harvest and throw away some every week, then mess with replacing phosban constantly. Besides, even though it is harmless to livestock, I would take a natural solution over a chemical solution any day.