Maybe suggest that they have separate instructions if they have enough real-estate on the bottle such as general directions and advanced hobbyist instructions (However, it's truly not too advanced lol) and knowing the amount of chloramine the product removes is fairly important and should probably be its own section. It could be a marketing push to have the average consumer burn through their product and only have certain info available online.
I know from checking the Pasadena Water & Power reports that I have a little more than half the concentration of chloramine in my tap water so 5ml actually is probably closer to 75 gallons or a tad more per napkin math. I did this several years while ago when looking at hardness,, average ph range, and mineral content when keeping past groups of Tropheus. Actually, the responsible thing to do would be to look at this years or last years report to see if the chemistry of the tap water has changed lol.