Home Slickdeals Waterdrop Advanced Series NSF 53&42 Certified Refrigerator Water Filter Replacements (various) on... Slickdeals Waterdrop Advanced Series NSF 53&42 Certified Refrigerator Water Filter Replacements (various) on sale for $ $9.89 By ARCOM - 21 August 2018 163 0 SHARE Facebook Twitter Go to the deal page: Waterdrop Advanced Series NSF 53&42 Certified Refrigerator Water Filter Replacements (various) on sale for $ $9.89