DC Foot Bath

All I know is I did the foot bath (free first time) and rich, green goo and green scum formed. I looked on the chart and, not surprising to me, that's gall bladder stuff. I was deathly ill after I had my gall bladder out; and further had an experienced Chinese acupuncturist tell me my main problem wasn't back issues, it was gall bladder. The green scum was impressive...I had an alcoholic friend do it and the color was different and the chart said it was liver problems. If it's a scam, it's an impressive one.