Can I use hydrated lime in my casing mixture?

You can, but you have to be very carefull how much you add.
In theory one should add 2/3 hydrated lime compared to the amount of limestone(calcium carbonate)needed.
The problem is that you have to add exactly the right amount if you use hydrated lime. If you add too much, the pH will go towards 13.
If you use limestone, the pH can't go above 8, despite the amount used.
To prevent this make sure to measure the pH of the casing material, it shouldn't go over 8.

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