The invention relates to the use of used alumina to reduce the level of inorganic contaminants, such as mercury and arsenic, from waste fluid streams. The method comprises the steps of a) injecting ozone into the solid matrix for a period of time known as the pulse duration; b) interrupting the injection of ozone into the solid matrix for a period of time known as the gap duration; and c) repeating step a) at least one additional time. The soft block can include a PEA polymer. In use waste water is introduced into the treatment chamber through an inlet and is caused to circulate around the treatment chamber through the pumping action of the shaft and air injector. The storage system also includes a second memory controller coupled to at least one second channel of a plurality of memory modules. The method may comprise the steps of: monitoring operating system events associated with input from a user to generate a series of operating system events; determining whether said series of operating system events is unrelated; and when said series of operating system events is unrelated, offering help to said user.