(1) Ihe ngwugwu ahụ nwere mkpuchi mkpuchi, nke enwere ike ijikwa ya ma nwee ike mechie ngwaahịa ahụ.
(2) N'efu nke ngwa ọkwa nri kwadoro BPA na FDA.
(3) Ọ na-egbochi ọkụ ultraviolet, oxygen na mmiri si n'èzí, na-eme ka ọ dị ọhụrụ ruo ogologo oge o kwere mee.