Chickens dont pee. They do urates, which is the white cap seen on most poop. Since they do NOT pee but have uriates instead ,it must be your roo has a extreme case of diarrhea. I would immediately add a good powdered probotic to everyones water. ( its good for everyone). The brand i trust and have used for years is Probios for poultry. It has a lot more various benifical bacteria in it than most probotics. You can order it online or sometimes tractor supply carries it in the poultry section. You get a better value and larger jar if ordered online. You will SEE A DIFFERENCE within a week. This is a excellent probotic. Make sure he has plenty of fluids. He can easily become dehydrated if his stool is like water.i know the Probios can help by adding different types of benifical bacteria back into his system.i cant speak for other probotics but i know probios works. I do hope this helps you out. Let us know how he does. I hope he gets well soon!