MOving my boys to a new boarding barn next week, and the paddocks are just dirt.. no grass. THey will be fed round bales. Because of the lack of anything but dirt, it is recommended we give them Sand Clear. Since it is a daily-for-a-week supplement, would you recommend we give it the first week they are there? Or would it be more effective if we wait a few weeks? I am not sure if it cleans out existing problems or is more of a preventative... any suggestions?