Chemex

Weighing instead of scooping is the only way to repeat a brew — beans differ in density and roast, so a scoop of one is not a scoop of another. Fix the dose and every other variable finally means something.

Chemex's thick bonded filter traps oils and fines and slows the flow, so the grind goes coarser than a V60 — closer to coarse sea salt. Too fine and the heavy paper clogs, leaving you with a stalled, bitter bed.

A Chemex filter folds into three layers on one side and one on the other, and the thick side goes over the pouring spout. That's not decoration: it covers the air channel, so brewed coffee can push air out as it drains. Put it in backwards and the brew stalls.

This paper is 20–30 % heavier than a normal filter, so it holds far more papery taste — a quick splash isn't enough. The rinse also preheats a thick glass carafe that would otherwise steal a good few degrees from your brew. Pour the water out before you add coffee.

Coffee and brewer finally meet, and it is worth its own beat rather than a clause in another step: the filter is rinsed, the kettle is hot, and until the grounds are in there is nothing to brew. Give the brewer a tap to level the bed — a bed sitting at an angle sends the first pour down the low side and extracts unevenly from there on.

Fresh coffee is full of trapped CO₂ that repels water and pushes the bed around. Wetting it first lets that gas escape — you'll see it swell and bubble — so the real extraction starts on evenly saturated grounds.

Chemex pours come in stages, not one long stream. The filter can only drain so fast, so fill to somewhere near the top of the coffee bed and then wait — chasing the level higher just floods the paper and stalls everything.

Start the next pour once the level has dropped back to the bed. Keep the water below the wooden collar — above that line it's sitting against bare glass rather than filtering through coffee.

The last pour brings you to full weight on what is usually a big batch. Aim at the walls to rinse stray grounds back down, then leave it alone — everything from here is drainage.

A full Chemex takes far longer to drain than a single-cup cone, and that's the paper doing its job. Expect four to five minutes from bloom to last drip; if it's finishing much faster the grind is too coarse, and much slower means it's too fine.

The paper keeps dripping long after the good coffee has passed, and what comes out at the end is the harsh, over-extracted tail. Lift it out the moment the flow breaks up — leaving it in slowly spoils what's already in the pot.

Coffee keeps changing as it cools: aromatics fade, acidity sharpens and sweetness comes forward. Drink it soon after brewing, and taste it as it drops in temperature — that's how you learn what to adjust next time.