Free Chlorine Low In Hot Tub. Lower your hot tub’s free chlorine level if it’s over 3 ppm. Once it finds bacteria, it attaches to it, which kills the bacteria and forms a chloramine (or combined chlorine).
9 of 10 new hot tub owners that i deal with always have too little sanitizer when they first get the tub. Adding chlorine shock to your spa is the fastest way to raise your chlorine levels. So, to answer the question, if your total chlorine is high but free chlorine is low, it is an indication that the hot tub requires a shock treatment.
Bromine/chlorine is needed in hot tubs to make sure bacteria are kept at bay.
Once it finds bacteria, it attaches to it, which kills the bacteria and forms a chloramine (or combined chlorine). This reading is the amount of chlorine present in the water of the hot tub that can sanitize the pool of all impurities and germs. Free chlorine is the chlorine that's searching high and low in your water for bacteria to destroy. Free chlorine is the chlorine that's searching high and low in your water for bacteria to destroy.
