For a person requiring ghusl, tayammum substitutes for that bath; for a person needing wudu, it substitutes for wudu. The outward ritual is the same.
When the disabling excuse ends, the rules governing water-based purification become relevant again; those nullifying conditions are treated later in the chapter.
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Tayammum: Valid Reasons, Conditions, and Method
For a person requiring ghusl, tayammum substitutes for that bath; for a person needing wudu, it substitutes for wudu. The outward ritual is the same.
When the disabling excuse ends, the rules governing water-based purification become relevant again; those nullifying conditions are treated later in the chapter.