Changling ultrafiltration me ¥mbrane is a food-grade alγλ$•loy PAN made of polymer materials, iφ÷∏t is one of the world₽≠" 's high-tech twenty-first cen$€♣tury, with low energy cons<∞umption, corrosion resistance, etcΩ∏., is an ideal water purificat®¶ion filter material .