Buying antiseptic is a ripoff. The most effective one is iodine-based, a 15 ml bottle costs $7. Yet for $12, at the same discount pharmacy, I can get what they call the Hospital version (same ingredients, same concentration) in a ½-litre bottle. But I’ll never personally use that much. I did have about 2 litres flushed through the wound caused by an elbow infection several years ago, though.