Not from me, but from my dealer. I was just away for 2 weeks at Disney World Florida. My Hot Spring dealer told me to lower the temperature to 80F, and dump in a couple of large capfuls of bromine granular. (made by Spaguard). Did that. Just got home last night to perfectly clear water. I raised the temp back up to 103F, and will put in my regular chemicals again.
This is not rocket science, I know, I've never been told this before and it worked like a charm, plus my cost of heating the tub to 80F even when the temps outside are in the 30's to 50's range, is almost nothing..
Mark