those open cells remain the same open surface during the pour and keep a constant flow rate of the molten metal during the pour the outer surface of the inoculant in the filter exposed to the molten metal regulates incoming heat source from the molten metal that is a big factor affecting the dissolution rate of the substitute of the inoculant into the melt such the outer surface is a sum of the open surface of the cells filled with the inoculant and remains unchanged during the entire pour and affords a consistent dissolution rate of the inoculant and therefore a consistent distribution of the substitute of the inoculant till the inoculation in the filter is totally dissolved and the blocked cells reopen to allow the melt through in the late pour while inoculating the molten metal the filter keeps the impurities away from entering the mold for the manufacture of metal casting free of inclusions the quantity of the inoculation dissolved into the molten metal depends on the pick up of the inoculant previously put in the filter 1 it has good compression strength and surface that can ease the special handling care during transportation and storage 2 it permits due to characteristics of the binder and additive a fast and consistent distribution of the substitute of an inoculant in a metal stream and a reduction in the amount of inoculant required for effective treatment and defects like inclusion 3 it enables any shape of the inoculation insert made upon job requirement 4 it allows selection of the area.