Is the impurity always forgiven?

The jurists differed concerning what is forgivable of impurities and their estimations:

- Hanafi school: They differentiate between light and heavy impurities. Heavy impurities (like urine, blood, alcohol) are forgiven if they do not exceed the amount of a dirham. As for light impurities (like the urine of animals whose meat is eaten), they are forgiven until they reach a quarter of the garment or if they are excessively abundant. - Maliki school: They forgive only an amount of blood, pus, and purulent discharge equivalent to a dirham, due to the widespread affliction with them and the difficulty of avoiding them. The dirham meant here is the dirham baghli. - Shafi'i school: They forgive a small amount of blood and pus and whatever is difficult to avoid, such as the blood from sores and boils, and what is not perceivable by the eye or has no flowing blood. The criterion for what is small and large is common practice (urf). - Hanbali school: They do not forgive a small amount of impurity, even if it is not perceived by the eye, except for a small amount of blood and what originates from it, such as pus and purulent discharge, excluding the blood of impure animals and blood exiting from the front or back private parts. For them, a small amount is that which is not considered excessive in the heart. - Ibn Taymiyyah: His madhhab is to forgive a small amount of impurity.