Hario's cold water dripper is as attractive as it is functional, and the yield is exceptional. The brew is low in acidity, bitterness and astringency. Cold brew can be stored in the refrigerator for 2-4 weeks. It's delicious served neat or over ice. Brewing with cold water preserves the delicate flavour compounds, while eliminating the bitter oils and acids that are only extracted at higher temperatures. A precision metal valve controls the drip, ensuring perfect drop-by-drop percolation. Coffee flows slowly through the stainless-steel filter and into the heat-treated glass pot below. Makes up to 750ml of coffee.