Product review (1 stars): I do not know the answer but these are expensive but really cheap pieces of crap (in our experience)
BTW HAVE CONTACTED THE COMPANY TWICE IN WRITING AND BY PHONE NO RESPONSE. Our filters are literally disintegrating within one week. RIDICULOUS. This has happened with the original filter and one replacement so far. I do not know the answer but these are expensive but really cheap pieces of crap (in our experience).