1. Ejirila ya na ngụkọta mmanụ, kemịkalụ mmanụ, kemịkalụ, ndị ọzọ na-eme ihe dị ize ndụ, mmanụ ụgbọ mmiri na ebe ndị ọzọ maka ebumnuche na ebumnuche ekwentị;
2. Kwesịrị ekwesị maka mpaghara gas gas 0, Mpaghara 1, mpaghara 2;
3. Igwe ọkụ na-agbawa: Klass Ia, IIB, IIC;
4. Kwesịrị ekwesị maka uzuzu uzuzu na mpaghara 20, 21, 22;
5. Ọ dị mma maka ebe achọrọ nchebe dị elu, iru mmiri na ikuku corrosive.