Remove over 99% of numerous potentially harmful contaminants, using a high grade carbon block. Long lasting up to six months or 300 gallons. Compatible with DA29-00020B, DA29-00020A, DA2900020A, DA29-00019A, DA2900019A, 04609101000, 46-9101, 469101, DA-97-08006A, DA-97-08006A-B, DA-97-08006B, DA97-08006A-B, HAF-CIN, HAF-CIN-EXP, HAF-CINEXP, HAFCIN.