I came across a public indoor Pool ,which is using CO2 in order to bring down the pH.
Sodium Hypochlorite is used as a disinfectant.
Now : It seems the TA creeps up by using CO2 and more and more CO2 is used the higher
the TA gets. . .
Doesn't really make sense to me that CO2 brings up TA - I suspect it might be the Sodium Hypochlorite
which adds to the Alkalinity build up.
Apparently TA levels should be kept at 80 - 90 ppm in order for the CO2 to do it's job ,
the pool in question got now a reading of 120 ppm. pH is kept at 7.35
In order to get down the TA one needs to add Hydrochloric Acid or Sodium Bisulfate.
Naturally this will lower the pH as well, which should not be a big deal as long it doesn't go below
6.80. Eventually it will creep up anyways, since Sodium Hypochlorite is used.
The pool manager wants to add Sodium Bisulfate instead of Muriatic Acid. . . I remember reading
somewhere that Sodium Bisulfate ( commonly refered as "Dry Acid") will bring down the pH , but not as much
the Alkalinity . . (?)
Any suggestions ?
Thanks in advance