- Adjust your Brew boiler Temperature:
- Dial To 98°C ( 208.4°F): Higher than normal basket Situation.
- Suggest Water Debit:
- 80~200ml/10sec, small water debit will cause some unstable extraction.
- Grind beans:
- RDT if you want.
- 14~18grams for H24.7 , I would suggest 16g would be a good start.
- Grind finer(3 intervals ) than normal. e.g. If you use 18gram before, try 16 gram dosage but Finer ground.
- Prepare your puck:
- No Bottom Filter Paper.
- Wdt if you want, I think that helps, especially when extract under low bar.
- Easy Tamping within 15 kgf , Flat base or Ripple base.
- After Tamping ,No Top Paper ,No Metal Puck Screen.
- Preinfusion with Low Pressure and shorter time:
- e.g. 0.5~2 bars, no more than 5 sec.
- Brewing Pressure:
- The lower the pressure the higher the flow rate.
- Light Roast : 4~6 bar
- Medium to Dark Roast : 6~10 bar
- No more than 10 bar
- Brewing Time:
- Doesn't really matter how long it takes, stop when you think its enough coffee liquid to drink.
- Brew Ratio:
- From 1:3~1:20 will be recommended.(YES, 1:20 not a type error)
- High quality light roast beans can reach the high ratio.
- After brewing ,rinse basket with hot water, and detach portafilter from your group head.This helps to prevent basket from clog coffee grounds.
- Enjoy your coffee.