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The Iwaki is a different matter as it's a dripper. You use grind to use it. In my shop We grind pretty course, cafetiere or slightly coarser.
50g of coffee goes in the filter section
Now place a wetted aeropress or similar filter paper on top.of the coffee, this is not essential but does mean the water is distributed more evenly through the coffee.
Pour 50g of water on to the paper, this acts as a present.
Place the dripper section on top and add another 450g of water. It should drip for 2.5—4 hrs depending on your grind and the coffee.
This makes just over 400ml of concentrate, we dilute 1:1 with filtered water.As for steep time, there is no set time, just that for grinding it takes less time. The best way is to try the coffee at regular intervals and figure out the time that works best for you.
So what are the steep times between course brew and whole bean? Bearing in mind I've just bought the Iwaki due to your recommendation.