Originally Posted by clasymover
Peeing in it is not a problem as it acts like a "french drain" where the urine goes through down to the hard pack and out. You can also rinse it through periodically. They pee in it because it doesn't spash back at them.
Good to know. It definitely got rinsed by the rain the other day. It down-poured. He was peeing on and killing the one and only tree in his paddock...so I guess this is a good change of pace