We have a page dedicated to addressing as many possible float contradictions and common inquiries possible. Read it here. (https://www.ogofloat.ca/who-shouldnt-float)
TLDR: Do not float if you have an infectious disease, open skin wounds or incontinence issues. If you have a fresh tattoo it's recommended to wait up to 6 weeks. Do not float with fresh hair dye - your hair must be able to pass a white towel test. If you are epileptic, diabetic, have kidney disease, chronic heart disease, or have a condition which may be adversely affected by cutaneous absorption of magnesium seek the opinion of your physician.