[Bromine use in spas]

In a Bromine system, 360 gallon spa:

What are the advantages of ph at 7.0-7.5 and TA balanced?

Clear water?

Impact on equipment?

I understand the aeration to inject air and lower the TA, but I get substantial foaming. so much that it spills over the sides of the spa in arm fulls.

[Can't Get Ph Down]

Please explain the 

acronyms or abbreviations.