Also, what kind of footing are you working in? Lots of geldings will find something to pee on/over to stop their legs getting splashed with urine....I've seen geldings pee on perfectly fine hay just to avoid getting their legs wet
If you are in footing that is deep and stops splashing he may be taken advantage of peeng on it? I've seen a gelding in a great big paddock walk all the way over to the hay to pee on it!
Just a thought?