Oh yeah, ChemGeek,
forgot to ask you about mixing bromine & chlorine...

for two years I kept emptying the hot tub into the donut pool that I had... figuring that I'd already paid to heat up the water ( so why put hot water down the drain).
& a TDS of 1200 is fine for pools...

the pool store said don't do it when I finally got around to asking about that this year for our IG pool.
I figured that bromine & chlorine are from the same family, so why not...?

( I don't do this now 'cause I have a Heat Pump)
but what are the adverse effects of mixing these chemicals?