Because the coffee grounds are in direct contact with the brewing water, coffee brewed with the French press gets more of the coffee's flavour and essential oils. These usually are trapped in a traditional drip brew machine's paper filters. French pressed coffee is often stronger and thicker than drip-brewed one. It also has more sediment. Because the grounds remain in the drink after brewing, French pressed coffee should be served quickly. Over time, the drink will develop a bitter taste. This is because the grounds still act on the water.