Hello, it can't be dissolved in water. The use is dispersed in any formula. It doesn't dissolve. If it is a mixture of bar soap can be added in any step that the mixer is convenient to blend, give
ผงถ่านกัมมันต์ is dispersible. The usage rate
Activated Carbon is not specific. Since it can be used from 1-100%, I recommend you to try it at 2-3% and adjust the increase or decrease as needed.