I've used both Aspen and pine. I like the Harlen brand labratory grade Aspen but it's 15 a bag locally. I switches to pine 🌲 because I can get it for 7.50 a bag. It may not seem like a big price difference, but when you use 6 or more bags a month, it can add up quick.
You can safely use any pine that has been kiln dried and is sold for the pet trade.
I use this
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