Hi.i am reza from iran. really i don't know how many membrane have been introduced and what kind of it have being discussed here.but anyway ask my question and hope to get useful answers. in membrane filter press the filter press producers importing membrane from china. no one and no company have produced it by itself up to now here.it has some special specification in filtration industry . as you can see in this video: https://www.youtube.com/watch?v=yBDqtMC55-M i want to know how to produce it by our own.what is that's formula?i mean the same formula filter press producers use to produce it? can anyone give some information about that? email@example.com thanks.