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The ENERGY STAR® Qualified LG - 26.8 Cu. Ft. French Door Refrigerator with Thru-the-Door Ice and Water - Stainless Steel, Model # LFX28968ST has an LG 6 month / 200 Gallon Capacity Replacement Refrigerator Water Filter (Part # ADQ36006101), Model # LT700P that has been tested and certified by NSF International against NSF/ANSI Standard 42 and Standard 53 for the reduction of Chlorine Taste and odor, Asbestos, Atrazine, Benzene, Carbofuran, Lindane, P-Dichlorobenzene, Toxaphene, 2,4-D, Lead, Mercury and Cysts (Cryptosporidium parvum oocysts). Your water softener is designed to remove dissolved minerals like iron, magnesium, calcium and manganese that cannot be trapped in the filter bed. However, they have resin beads with sodium attached to the resin and some people claim that they can taste the slight salt taste due to the traces of sodium in soft water. However as far as the hard water affecting the water and ice dispenser, that will not be an issue since the water softener is already removing the above mentioned dissolved minerals. LG refrigerators have recommended default temperature settings (Refrigerator: 37°F, Freezer: 0°F). You'll want to set the temperatures for both compartments properly. The more food stored in the unit, the hooter the ambient temperature of the room or the more the unit is opened and closed, the cooler the refrigerator should be set...^IFV