WLF-20B - Replacement Filter for Samsung DA29-00020B, HAF-CIN/EXP, DA-97-08006A NSF 42 Certified for Quality Materials and Structural Integrity Made with Advanced Concentrated Carbon Technology for Enhanced Purity 400 Gallon capacity (recommended to replace every 3-6 months) 0.5 micron rating (nominal rating is 0.3 micron) Manufactured in South Korea, Guaranteed Quality and Filtration Performance!