I think folks use too much Bayer for dipping. They get away with this because it is gentle on the corals and even though it's at high doses, doesn't negatively impact the corals.
The original dosing video that was done with Bayer was 0.8 mls per 100 mls of tank water. To simplify, I do 1 ml per 100 mls, and typically make up 300 mls for doing a couple frags.
I dip for 15-20 minutes, with occasional agitation. Here's the important thing...you need to thoroughly rinse so you don't introduce the dip into your tank. This is two, 15 minute rinses with tank water, discarding after each rinse.
If interested, I did a survey a number of years ago, and
HERE's the summary of what folks are dosing.