Source text
ثُمَّ الْمِيَاهُ عَلَى خَمْسَةِ أَقْسَامٍ...
The text divides water into five legal categories:
1. طَاهِرٌ مُطَهِّرٌ غَيْرُ مَكْرُوهٍ — pure and purifying, not disliked.
2. طَاهِرٌ مُطَهِّرٌ مَكْرُوهٌ — pure and purifying, but disliked for use.
3. طَاهِرٌ غَيْرُ مُطَهِّرٍ — pure in itself but not purifying for ritual impurity; this includes used water.
4. مَاءٌ نَجِسٌ — impure water.
5. مَاءٌ مَشْكُوكٌ فِي طَهُورِيَّتِهِ — water whose purifying capacity is doubtful.
This level focuses on the first three categories.