It's been a month since I changed out the water in our hot tub - this was the first water change-out since we filled the new tub. Following the recommendations on this site I built a bromide bank (which I didn't do the first go 'round) and added Gentle Spa as well. All I can say is wow! Things have have been so steady and easily maintainable this time. My pH has been steady and the Frog floater has actually worked and maintains a nice steady Br level - even when we went out of town for 5 days. The Gentle Spa has made the water more pleasant feeling too. All I do is add MPS at a rate of 1.8 oz per hour of use and toss in a couple ounces of 8.25% bleach once a week.
Current levels are:
Br = 4 minimum
pH = 7.6 and I haven't tweaked it once after the fill adjustment
TA = 60 and I haven't adjusted it either
CH = 140 steady
This gives me a CSI of -0.2 per the Taylor Watergram.
I think all the levels are decent though the TA and CH are a little lower than the standard "recommendations" that I tried to maintain during the first fill. Thanks for all the advice here and holler if anyone sees a level I should be concerned with....
Thanks again for a great site/advice!