The amount of water you add, really depends upon how soft or firm you prefer your pillow. We recommend staring with 3 liters/ quarts which would be classified as medium. After sleeping on the pillow for a few nights you will know if this is the perfect amount for you, if not we recommend adding or replacing 1 cup of water at a time and testing the pillow while you sleep.
Soft= 2 Liters/ Quarts
Medium = 3 Liters/ Quarts
Firm = 4-5 Liters/ Quarts
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