it's time for me to shock the tub again. i flushed and refilled the tub about 2 weeks ago. last weekend i took out the bromine floater and i shocked it with 3 tbsp granular sodium dichloro-s-triazinetrione dihydrate. the tub does have a ozonator. the next day bromine still high "k-1004 test kit only reads to 10" and we use for tub for about 15-20 minutes. so 30-40 minutes of tub use. i thought we would knock it down by being in it. so we didn't add anything after our dip. the next 2 days we used it about the same amount of time without adding anything. floater was sitting on a chair by the tub. we shocked it on saturday and it took until wednesday for it to drop under 10 ppm. needless to say we had to shower after leaving the tub sunday and monday.
i read about hydrogen peroxide knocking down the bromine level. but i really hoped i didn't have to do that each time i shock it.
is it normal for it to take that long?
i've got a 400 gallon tub and 1 tbsp should raise it 6 ppm. reading was 6-8 before use and i added 3 tbsp so it should of been 24 ppm max.
with using the bromine 3 stage system with a ozonator. i find i only need about 1 tbsp for about evey hour of use.