Ettan DALT Filler Sheets are used during the filling of the Gel Caster. Fill the gel caster starting with a separator sheet against the back wall. The separator sheets make it easier to remove the cassettes from the unit after polymerization. Fill the caster by alternating cassettes with separator sheets. The rubber hinge should be on the left side of the caster, with the matching ends of the cassette down. End with a separator sheet then use the thicker 1.0 mm filler sheets to bring the level of the stack of cassettes and spacers even with the edge of the caster.