Delter Coffee Press is the first coffee maker designed from the ground up, to solve one of the biggest coffee brewing problems-agitation. Uncontrolled agitation results in bitter coffee and inconsistent extraction. Deleter's unique Jet-Seal keeps the brewing water and coffee grounds separated preventing uncontrolled agitation. Water contact is activated by actuating the Jet-Seal with pressure, offering complete control over water flow and agitation. The result is an exceptional cup like no other. Less bitterness with more clarity.