3 Cup Hario Syphon brewer. Syphon is definitely for the home brewing scientist! Once your skills are honed with syphon you can manipulate results by amending agitation, heat, dose and grind variables. This is definitely a process for the hands on brewer. A vacuum coffee maker works on the principle of expansion and contraction of gases, actually one gas, water vapour. This is what allows the device to brew a full infusion style of coffee, filtering the grind and leaving a clean pristine cup
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