The urine is white cloudy? That might mean that he is taking too much calcium.
Read this:
http://www.guineapigcages.com/forum/...arts-info.html
Fruits should be given ocassional as treat, because they are high in sugar. The carrot also has a lot of sugar.
If his a satin: I know there are some sickness related. Maybe a rescue person can tell you where to look.
My piggies will pee and poop as close as 15 min. For my piggies that is normal. Anyway ask the vet just in case he finds something strange.
Did you read this:
http://www.guinealynx.info/normal.html