My wife could not believe I was adding water tanks to our property with three fresh cool streams! After watching a Jeff Sturgis video on water troughs being added I though what can it hurt. After adding my first three tanks (dry with now water added) it took approximately six weeks for Mother Nature to fill them for me. Once they were full it was amazing how quickly the deer began using them! I am now a believer and can't wait to see them work this fall!