Home Slickdeals Waterdrop Advanced NSF 53&42 Certified Refrigerator Water Filter Replacements (Various) on sale... Slickdeals Waterdrop Advanced NSF 53&42 Certified Refrigerator Water Filter Replacements (Various) on sale for $9.89 By ARCOM - 28 September 2018 160 0 SHARE Facebook Twitter Go to the deal page: Waterdrop Advanced NSF 53&42 Certified Refrigerator Water Filter Replacements (Various) on sale for $9.89