Place the filter on a net with the mouth of the filter facing up and place it on the stove over high heat.
Grill until white smoke comes out of the filter and no more smoke is produced, about 10 minutes.
Use tongs to rotate the filter while baking all over.
*The filter is very hot after baking. Allow it to cool sufficiently before picking it up. *Quick cooling or heating may cause the filter to crack.
Be careful not to burn yourself.
Boiling + baking soda (baking powder)
Put enough water in a heat-resistant bowl, add 2 spoons of baking soda or baking powder, and heat the filter in a microwave oven (500W/5 minutes, 700W/3 minutes).
Alternatively, put 2 spoons of baking soda in a pot of boiling water and boil for 10-20 minutes.
Be sure to turn the filter mouth up.
Rinse well with warm water to remove the baking soda before use.
Baking soda (baking powder) must be sold as a food additive, antacid, etc.
The filter is extremely hot after boiling. Allow it to cool sufficiently before picking it up.
*Quick cooling may cause the filter to break.
Insufficient boiling time may result in no improvement.
*Some effect can be obtained without using baking soda at the time of boiling.
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