The 3 issues I have are
1) You bought it from a dog food company (Bosleys brand)
2) It claims to remove heavy metals. All by itself. Must be some long legs and strong arms on whatever organisms are in that bottle.
3) Replace slime coat? Salt? Irritants? Slime scraped off another fish?
Other than that, it probably works just fine. It's probably rebottled Prime or TSS+. Maybe someone here has used it, but probably not in a situation that would prove results.
Personally I use Nutrafin ChlorXChange, but that's mainly to save shipping costs.