Welcome to our forum.
Bromine. Because it works well in hot water.
Nat 2, shock and chlorine..
Don't panic, if your using chlorine your killing nastys in your water. Read some posts here and on other sites. MPS is a shock option (oxidizer) Just sanitize for sure with something to start and don't over manage your water. Relax and enjoy the tub!If we can get water readings its pretty easy to instruct how to balance your water. Chlorine is a good start. 2-3 PPM after soak should be 1 or lower by next day for your soak. If it's 2 days your even more golden chlorine will be very low .2-.4 like drinking water. And your ozone and minerals will polish your water.We will talk about the sanitizer (if chlorine is your choice) and how it effects your balance (PH/TA) next folks.