GE Ettan™ DALT Filler Sheets are used in the process of filling of the Gel Caster. Fill the gel caster starting with a separator sheet against the back wall. Separator sheets make it easier to remove the cassettes from the unit after polymerization. Fill the casters by alternately using cassettes with separator sheets. End with a separator sheet, then use the thicker 1.0 mm filler sheets to make the level of the stack of cassettes and spacers even with the edge of the caster.