Looks like some more experienced keepers who have dealt with rot have chimed in. I will still say that while paper towels or newspaper is definitely not as attractive, it is VERY easy and cheap to maintain. If there's any kind of waste, you'll see it immediately. Just take out the snake, take out the soiled paper towels, if it's pee, I wipe down with hot damp rag, then replace the paper towel and snake. Every few months I'll take everything out and completely wash the tubs, but I've never had a problem with that method.