It doesn't seem to do anything at all. Gave the same results when I put my feet in the water and didn't put it down. Most likely the color comes from the iodine in the salt. If you decide to try the experiment, be sure to wash your feet before using it, as it can react to the oils and salts already on your skin, which can increase the salt concentration in the water. from inside your body, not from the surface of your feet.
Electric massager Kitfort KT-2905, black/grey
64 Review
Versatile Back Massager with Heat - Perfect Gifts for Christmas, New Year, Mother’s Day, Father’s Day, Birthday - Shiatsu Neck & Shoulder Massager for Pain Relief and Muscle Relaxation
32 Review
Vacuum cleaner Polaris PVC 2003RI, grey/red
74 Review
STICKON Stainless Steel Gua Sha Scraper For Soft Tissue Mobilization And IASTM Therapy (M Shape) - Effective Massage Tool
43 Review