Hi kj1999,
Your Bromine kills all the mean and nasty things in the water. You MUST use a "residual sanatizer" such as Bromine in your spa. 3-5 Parts Per Million (PPM) Shocking with a non-chlorine ( Potassium ) shock weekly is necessary.
Virals such as E-Coli will proliferate 1,000 fold in a twenty four hour period in untreared water. (or something frightning like that).I understand your frustration with the floater, and PPM fluctuation, however stick with it.
PH ( Potenz Hydrogen to the Tenth Power ) is an exponential scale that fluctuates with use, and sanitizer.
The KEY to PH bliss is what we call " Total Alkalynity"
TA is the total alkaline properties of the water, or buffer.
TA is also a direct measure of "Sodium Bicarbonate" or Baking soda in the water.
This is the "Big Chemical Pillow" that helps your PH behave between testing.
A tablespoon or two of Arm and Hammer will make life easier. ( also makes a good bug, and tar remover for the car )
3-5 PPM Bromine
80-120 PPM TA
1 ounce weekly Shock,
and Hose, Hose, Hose that filter weekly. (please don't put it in the dishwasher....I think I'm gonna be sick...)
