High Bromine Levels
Posted 12 September 2012 - 11:52 AM
Also ph is really high above 8.4 and TA really low, below 40 and cant seem to stabalise. Add dry acid and falls for couple of hours but then next day high again. Please help this new hot tub owner......
Posted 12 September 2012 - 05:16 PM
That's a bit strange that you can't have your pH stay lower with such a low TA level. Perhaps your ozonator is on so much that it is aerating the water a lot. Again, turning down your ozonator on-time should help. You could also add 50 ppm Borates to the water to slow the rate of pH rise.
Posted 12 September 2012 - 10:07 PM
Now for a little chemistry lesson. HIgh sanitizer levels (either chlorine or bromine) will cause a chemical interference with the phenol red indicator used to test for pH and cause it to read high when it is not. Depending on the test kit or strips the can occur at chlorine or bromine levels as low as 3 ppm but in better kits such as the ones from Taylor are good up to about 10 ppm. You did not state how high your bromine was, just that it was above 10 ppm which leads me to believe that you are testing with strip and you do not have a Taylor K-2106 for bromine ( or a K-2006 for chlorine) because you would have posted just how much higher it was because these kits can read levels up t around 50 ppm.
So you have high bromine and it is converting the phenol red indicator for pH into bromophenol red and bromophenol blue indicators which have a similar color change but at a much lower pH level. Your pH test is turning a deep red purple color, is it not? All this tells you is that your pH is somewhere in the range of 4-6 to 6.8 or higher. However it can be as low as 4.6 and still produce this color! For the color to change to what appears to be a 'normal' pH (such as around 7.6) it means the pH is below 4.6! Are you following what i am saying?
The fact that your TA is around 40 ppm is good indication that your pH has "crashed".
Posted 13 September 2012 - 07:58 AM
FALSE READINGS: high levels of chlorine (usually > 10 ppm) will quickly and completely convert phenol red into another pH indicator (chlorphenol red). This new indicator is a dark purple when the water's pH is above 6.6. Unfortunately, some pool operators mistake the purple color for dark red and think the pool water is very alkaline and wrongly add acid to the pool.
Posted 13 September 2012 - 08:40 AM
The bromine llevel on the indicator stops at 11ppm but is a deeper pink than that so is a lot higher. Interestingly when i test with strips which i have also got the ph does read about 6.8 ph but with the tabs above 8.4ph (again where it stops on the scale) and is a very deep pink colour. which one is right. guessing the strips from your last info. I have not added any dry acid as i wanted to see what came back on here. Good job as i would have been making the water even more acidic.
So the ph is not high but low due to the acidic conditions of the water. So what do you suggest an empty and refil.?????
Posted 13 September 2012 - 08:48 AM
Ways Bromine sanitizer levels will drop:
1. Using the tub
3. Something growing in the tub
It isn't going to just drop on it's own, so if you shocked it to 11+ppm, covered it, and left it for a week, and have an ozonator, it's not likely to move much, even if you left the floater out.
Posted 13 September 2012 - 08:48 PM
jeffinpickering, I agree with your solution to the problem!
barnlsley_teaher, that means your strips have a halogen inhibitor built into the test and your tablets do not, making the strips a better test. Are your tablets from Palintest by any chance?
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