No idea. Half the time I cant even find Caesar's piss unless it leaves urate. I just throw it all out once a month regardless. And on a side note, Caesar took his first piss outside the cage.....right on my foot.... I was relaxing watching tv and felt a warm 'rain' on my bare foot. I look down to see Caesars butt hanging down pissing on me.....he couldn't wait until his cage was clean. I had him out since I was changing his substrate so I relaxing watching tv while I let the F10SC soak in the cage lol.