Water to ingredient ratio

Hi all,

I remember watching a video about how one should add a specific amount of healing ingredients to a specific amount of water when doing a foot soak but I forgot the ratios and can't find the video.

In the video it was claimed that if one mixes to much or to little then there will be less or no absorption and less or no detox.

Anybody knows how much healing ingredients should go with how much water in a foot soak?

Thank you