It's just porcelain and water. You can buy slip pre-mixed or buy thowing porcelain and mix it with water in a blender. The cheapest is to buy it dry. Any ceramic supplier should have it.
I look at the chambers I make as disposable. They last a few months and then get pitched. They are easy to patch with the same mixture and you can keep them going longer if you want.
I started off with some expensive high tech castables over ten years ago, but they really didn't hold up much better.
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