(1) ultrafiltration membrane Ω¥εionic state can not be filtered conduc×∏tive substance, and therefore no c™♥hange in conductivity.
(2) Conductivity is us≤↕₹®ed to reflect the ion content in the ÷≠water, not a measure of qua∞$₽€lity standards of water quality.δ≤£₽ Such as natural minera↔&l water is much higher tha↕₹'n the conductivity of p✘≈↑ure water conductiviε☆ty.