Quote:
Originally Posted by strange_wings 
Animal feeds are tested 20ppm for mold toxins. Worlds Best claims to test for 20ppm, too.
Both have the same risk for mold toxins.
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That is not necessarily true though.
They may both be tested for 20ppm, and I would agree that since it is feed that manufacturers would abide by the same safe handling procedures (if not more so), but technically the feed may not be heat-dried to the same ultra-low moisture level prior to crumbling and packaging, and the packaging may not be air/moisture tight.
WBCL claims to super dry theirs to remove moisture, and the bags are clearly air and moisture tight. They also claim to add clumping additives (they only specify it as "other plant materials" whatever that means) which could even further enhance protection by keeping the rest of the litter extra clean. I haven't heard of any aflatoxin lawsuits or recalls for WBCL to date, and its not a new product.
From what I've read, there isn't cause for alarm if the product is good out of the bag, as an indoor environment would not approach the high temperatures, air humidity, and litter moisture levels needed for aflatoxin to grow as it needs pretty specific conditions. So I don't think there is any need to try and reseal the bags for a normal home environment which is not likely to exceed human comfort levels > ~70% humidity and 80oF.

My house in particular doesn't go above 77oF setting on the A/C and moisture levels are under 50%, too cool and dry to worry about it. Some people do keep their litterbox in their bathroom though, and if taking lots of hot showers w/o ventilation, I could see how it could get very warm and wet in there and could be an issue over time.