This is an open question to all. I am a novice horseman and have recently set fencing for a 95' X 120' arena. I live in Litchfield Park, Arizona (near Phoenix). After just a few days with horses the soil in the arena has turned to powder when dry and any movement creates a cloud of dust when wet it becomes both tacky and slippery. I am considering a 3" layer of grindings however it is quite expensive approximatley $1000 for arena of this size and I fear it my only be a temporary solution. I would appreciate suggestions from anyone familiar with this issue. I can and will make the investment in grindings but am hoping there is a either a less expensive or a permanent solution for the issue.