I recently switched from wood shavings to sand in my co-op this summer and loved it. It's easy to maintain and is way less stinky. However, I went to scoop out beneath the roost the other day and it was frozen solid. Not surprising I guess with highs in below zero. But know there are mountains of poop because I can't clean them out. Do other sand users have this problem? If you do, how did you solve it?