1. A water filter is a device that's usually attached to your faucet or water supply that filters out unwanted sediment and minerals from your tap water. A sediment filter acts as a barrier against the different types of sediment and purifies them out of your water before it enters your home.

2. Sifted flour, which is much lighter than unsifted flour, is easier to mix into other ingredients when forming a cake batter or making dough. When flour is sifted with other dry ingredients, such as cocoa powder, this helps to combine them evenly before they are mixed with other ingredients. As with cake batters, lumps can form if you don't sift the flour. If a recipe doesn't call for sifting the flour, just give a few whisks (use a wire whisk) in the bowl. Flour settles when it's stored, so whisking aerates it.

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