Vacuum
A siphon, or vacuum pot, brews by full immersion, then a vacuum pulls coffee down through a filter: clean and even, and fun to watch. Method and filter care.
A siphon — or vacuum pot — has two chambers. Water in the lower one is heated until vapor pressure forces it up a tube into the upper chamber, where the coffee is. When you remove the heat, the lower chamber cools, pressure drops, and the vacuum pulls the brewed coffee back down through a filter.
Two properties combine that most brewers cannot manage together.
Full immersion. All the coffee is in contact with all the water for the whole brew, so extraction is even in a way pour-over cannot match.
A proper filter. The vacuum pulls the coffee through cloth or paper, so the cup is clean rather than silty.
The result is clarity with an even, complete extraction — clean like a pour-over, even like an immersion.
It is fiddly, fragile and slow, and it requires a heat source, a stand and a filter regime. Most of what it achieves can be reached with a good immersion brewer and a paper filter — a Hario Switch, for instance.
It is also genuinely spectacular to watch, which is a legitimate reason to own one.
Cloth filters must be rinsed thoroughly, stored wet in the fridge, and replaced every month or two. A dried-out cloth filter goes rancid and ruins the coffee.
It is genuinely distinctive: very clean, with full immersion extraction and a filtered finish. Whether that is better than a good V60 is a preference. The theatre is a real part of the appeal and it is fair to admit it.
Cloth is traditional and gives the cleanest cup, and it must be kept wet in the fridge and replaced regularly or it turns rancid. Paper is easier and slightly cleaner still. Metal is lowest maintenance and lets more oils through.
The equipment this actually requires — not a shopping list, the shortest route to doing it properly.
64 mm (2.52 in) flat burr · filter only · single dose
64 mm (2.52 in) flat burrs, near-zero retention and a footprint the size of a mug, built for filter and honest about not doing espresso. For pour-over it is the clearest grind you can buy at this price.
Best for: V60, Chemex, AeroPress and batch brewing, where clarity is the whole point.
2 kg (4.4 lb) × 0.1 g (0.004 oz) · flow rate · under-portafilter footprint
Fast enough for espresso, small enough for a drip tray, and it shows flow rate — which is the one number that tells you what your shot is doing while it is still happening.
Best for: Espresso, where 0.1 g (0.004 oz) and a fast refresh genuinely change what you can control.
