On a related point, this has been mentioned before here, but it is worth mentioning again.
I'm all for recycling, but please be aware that playing around with USED cat litter can be hazardous.
Who knows what effects large volumes of litter embedded in the walls of a house might have? Even for people who do not anticipate a pregnancy in their future, could large volumes of used cat litter in a house affect anyone over time? What about a pregnant visitor? I know I wouldn't have a peaceful night's sleep for years if a friend visited me and then had problems with their pregnancy.
Considering that there are many other options available, and the poorly understood risks in this particular application, I encourage all papercrete enthusiasts to avoid used cat litter.
http://familydoctor.org/online/famdocen/home/women/pregnancy/illness/180.html
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