Lus piav qhia luv luv:

Cov fiber ntau daim nyias nyias yog siv los ua cov tub ntxhais membrane ntawm lub lim, aperture 100 ~ 300nm, siab porosity thiab loj tshwj xeeb deg cheeb tsam.

Teem sib sib zog nqus nto thiab zoo pom nyob rau hauv ib qho, cuam tshuam qhov sib txawv particle loj impurities, tshem tawm cov hlau hnyav xws li calcium thiab magnesium ions thiab tshuaj tua kab mob los ntawm cov khoom, txhim kho dej zoo.