Sodium Bromide - How much chlorine to add daily?

[Terv]

315 gal hot tub
Tested with Taylor K-1004 test kit.
pH 7.4
TA 60 ppm
CH 150 ppm
Borate 40 ppm (based on the Gentle Spa label recommended amount)
Sodium Bromide 30ppm (based on the label's recommended amount)

I added 2 oz sodium hypochlorite (10%) around 3:00pm.
Evening test strips showed both chlorine and bromine in the 5-10ppm range.
By 7:00am the next morning, no chlorine or bromine reading.

QUESTION: How do you calculate the amount of chlorine to add for the 2-step bromine system to keep the bromine level above 2-3 at all times?

Establish a bromine bank, add chlorine daily, target 3-5ppm bromine.

QUESTION: What bromine range through out the day should be expected for the 2-step system?

Thank you.

 

[pooldv]

I am not a bromine user and don't know the answers to your questions. Maybe this article on bromine will help, How do I use Bromine in my spa (or pool)?

 

[Brian VT]

It will depend what there is for the bromine to work on.
Try 3oz. and see what is left for residual and adjust as needed.