Tx for taking the time to reply Greenhorn.
Should I be concerned of what the manufacturer rep told me that it is not recommended to use floaters with bromine as it can lead to over-sanitization, which could lead to extra wear on spa parts/equipment such as pump, heater, seals? For example, after my wife and I moved into the home, I soon thereafter noticed that the spa was leaking from the equipment compartment. It turned out that one of the seals/washers on the pump had failed due to wear. It was replaced. I emailed my manufacturer rep and he stated that it is possible that the bromine floater that was being used could have caused this. As such, he recommended bromine granules. But, it makes no sense that it was never mentioned to me about setting a bromine reserve. It does not seem logical that it is possible to use my 300 gal. spa right after a water change with having balanced the water chem and sanitizing with 3 tsp. of bromine granules and MPS, vs. setting up a bromine reserve.
Perhaps, the wear on the pump seal was attributed to other chemicals being out of balance, pH or TA. Could that be?
Lastly, in Waterbear's post here and at TroubleFreePool titled "How do I use Bromine in my spa (or pool)?", it discusses that either MPS or chlorine can be used to shock. Which one will have less effect on TA and pH? Also, with either the step 2 or step 3 method, do I add any bromine granules or shock after using the spa (I have been told to use 1 tsp of bromine granules after using the spa)?