So, I've just read that much of the sandbox sand that is sold is toxic because it contains hydrated silica or something like that. I can buy special sand that is more expensive, or I can buy pea gravel. Is pea gravel fun? Do kids like it as much as sand? More? Of the two options, I would be inclined to buy whichever a toddler would enjoy more. (Our toddler does not put things in her mouth, so choking is not a problem.) Yes, it's for outdoor use. Why don't kids enjoy pea gravel? I am just curious; I can order the safer, expensive sand if need be.