So what is it? When I asked, the ranch owner responded:
ArenaKleen® is the only horse arena dust control product that eliminates the health hazards of dust as it improves the consistency, cushioning, traction and support or the arena footing material. With ArenaKleen® dust suppressant, horses, riders and trainers can work safely and comfortably in the arena, stables or anywhere dust is a problem.
Most horse arena dust control products just coat the dust particles. Arenakleen® works differently. ArenaKleen® is formulated to absorb into each individual soil particle. This means that soil particles remain in direct contact with each other insuring firm footing, excellent traction with no stickiness, thus no tracking.
By absorbing into and not surrounding the soil/or dust particle the individual particles remain in direct contact with each other keeping the soil surface firm, with good coefficient of friction (traction). The product is not alkaline, it is not acidic, it is non-corrosive, and non-hazardous. Watering is never required. Climate or humidity is not a factor. It does not wash away or dilute in rain events. Reapplications after the initial application are done at a much lower rate to renew highly effective, long lasting control.
And to finish things off, I offer a completely random, unrelated piece of trivia: An adult horse’s brain weighs about 22 ounces, about half as much as the human brain. On the other hand, the average horse's heart weighs approximately 9 or 10 pounds while the human heart weighs between 7 and 15 ounces. That might explain a few things.