What you’ll need: Chemex, Chemex filter, Kettle, Digital Scale, Timer
Preparation
⇒ Bring water to a boil
↳ Let the kettle sit for about 30s for the water to settle
⇒ Place the filter inside the brewer
↳ Open the Chemex filter so that there are 3 layers on one side and 1 layer on the other
↳ Line up the side with 3 layers with the spout of the Chemex
⇒ Rinse the filter with hot water
↳ This will "prime" it, and help it adhere to the glass
↳ Make sure to pour out rinse water before continuing
⇒ Weigh and grind 50g of coffee
↳ Grind to a medium-coarse setting
↳ All grinders are different, but generally you want to set the grinder to 3/4 of the way to the coarse end (bigger numbers are coarser)
⇒ Pour ground coffee into the rinsed filter
↳ Make sure the coffee bed is flat to ensure an even extraction
⇒ Place the Chemex on your scale and press tare to set the weight to zero
Extraction
⇒ Begin your timer
⇒ 0:00 - Pour 90 grams of water onto to the coffee
↳ Wait 30s while the coffee degases
↳ This is called the bloom
⇒ 0:30 - Slowly add water to the centre of coffee in a circular motion until you have reached 250g
↳ Allow to drain
⇒ 1:30 - Slowly resume pouring until you've reached 450g
↳ Allow to drain
⇒ 2:30 - For the final pour, continue until you've reach 700g
↳ Allow to drain completely
⇒ Total brew time should be no more than 4min
↳ If by 4 minutes your coffee has not fully drained, remove the filter and place in the sink until it finishes draining and grind slightly coarser next time.
⇒ Swirl the coffee for about 10s
↳ This will add oxygen to the brew and make it sweeter
⇒ Enjoy your coffee!
Source: spectrumcoffee.com