I've heard many different options about substrate and was wondering which everyone uses and what its pros and cons are.
I use the soft kind of cage carpet,and it does the trick perfectly. I keep 2 other spares,so whenever its soiled(which seems to ALWAYS be as soon as i put a new piece in,darn snake) I just take it out and throw it in the laundry. I dont see many cons too it,its perfect for me, no scooping out poops. I used to use safe dirt for bedding,but it was too much of a pain and have since switched,luckily it was after the first feeding.
I'm pretty new to keeping BPs and don't much about them but I noticed you said you throw your soiled carpets in the laundery. Something I do know a bit about is germs and parasites, since that's what my job entails, and I do know that washing machines aren't usually hot enough to kill some fecal germs and some parasites. If you're not doing it already, I'd reccommend washing your carpets seperate from clothes and linens (I'd put them in with rugs and bath mats maybe) and maybe spraying them down with a disinfectant before going in the wash.