Hello sir, to be honest i try to reply you about 5 times and every single time im stack with answer.
Im just the guy who support WL team on meso forum, and few different source. I dont know what filtration system be used during production. To be honest i was asked about this before and i have ask our guys who is responsible for product quality, and they told me that for different products could be used different filters also it could be depends on raw's.
I know this is not the answer you would like to hear, but i will be just honest with you.