Why is my rabbit's urine such a funny colour?

I have never had a rabbit before, so therefore I don't know what their healthy urine should look like. My rabbit is nine months old and he is a neutered male, so it's not territorial urine. The urine is like a pale white-ish yellow that is very grainy and thick. It takes him a little while to pee and there's a LOT of it. He has stained his hutch floor with it and the area is all bleeched. Is this normal? I'm worried about him.