Severe impurity is assessed by a dirham measure, whereas light impurity is assessed as less than a quarter of a garment. The two thresholds cannot be interchanged.
Thus the specific discussion of an edible animal’s urine should not simply be assessed as though it had the same dirham limit as human urine or blood. These measures concern prayer validity, not the intrinsic nature of filth.
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Types of Impurity and Methods of Purification
Severe impurity is assessed by a dirham measure, whereas light impurity is assessed as less than a quarter of a garment. The two thresholds cannot be interchanged.
Thus the specific discussion of an edible animal’s urine should not simply be assessed as though it had the same dirham limit as human urine or blood. These measures concern prayer validity, not the intrinsic nature of filth.