Chovala chapakati cha mgxswv, ulusi, 200μm kapena 250μm, umayikidwa mu chubu chopangidwa ndi pulasitiki kwambiri. Machubu amadzaza ndi madzi - Pawiri. Chubu chimakulungidwa ndi tsamba la pstale nalo. Pakati pa PSP ndi madzi otayirira - Zinthu zotsekemera zimagwiritsidwa ntchito kusunga chingwe ndi madzi. Mawaya awiri ofanana amaikidwa mbali ziwiri za tepi yachitsulo, pa chingwe chopyapyala chamkati, chingwecho chimamalizidwa ndi polyethylene (pe).