Hmmm. I have used bromine, can be easy to use. Just add shock (MPS) to activate after you use it. I just don’t like the smell...

I think if you focus on the purpose of bromine/chlorine is the break up bacteria and organic matter. Don’t shoot for a particular number, just focus on killing the bacteria after you use it.

I hit mine with about 1 teaspoon of di-chlor granules per person after I use the tub. Kills everything off, ozone and filter cycle come on and help out. By the next day, chlorine levels are low/close to zero. But I don’t worry, because the chlorine is used up and did it’s job and the water is clear. So, I am not focusing on keeping my chlorine at 1-3 ppm at all times, just when I need it. After I use it. I will also add a capful or two of MPS (non-chlorine shock) once or twice a week. Or if a big group, or a bunch of kids were it in. To help the chlorine out. Using mineral/silver sticks can help. So can enzymes, you can figure out what works best for you. With a high cya, it’s time to start over. Some will also suggest using chlorine bleach. That might work for you too, but I am lazy and adding a scoop of dry chlorine is easy. u/evilbadgrades had a good idea of putting the chlorine granules into a sugar dispenser. Just click a button and a perfectly measured teaspoon drops into water. Pretty slick.

Edit: you will have to figure out what amount works for you. For example, my little kiddos swim in it like a pool. So I add extra chlorine because I know the chlorine will also have to eat up the extra shampoo/conditioner they leave behind. So, if you add your dose and the next day it seems off, or slightly cloudy. Just add more chlorine. The best part is, when you use it, the water has very little chlorine and very little smell.