Abu Humayd continues on the topic of tayammum and discusses many key topics; from them are:- when tayammum is able to be used as a substitute for water and the evidence to support this statement- the things that nullify tayammum- the method of performing tayammumMany more important topics are also discussed, such as what to do if one has prayed in a state of tayammum due to having no water available, and then later the individual finds water.For detailed benefits please listen to the full talk Baarakallaahu Feekum.