Question for other BBB applications?

[waterbear]

There is a modified BBB method that works well in tubs knows as the Dichlor/Bleach method.
Hot tubs are normally kept covered and the use of CYA should be kept at a minimum (20 ppm) or there can be problems with such things as pseudomonas (because of the higher water temperatures). CYA levels this low are next to impossible to test for accurately. The answer is to start up the tub with dichlor, which adds 9 ppm CYA for every 10 ppm chlorine added and when enough dichlor has been added for the water volume of the tub you would switch to bleach for chlorination. Since hot tubs are drained and refilled every three to four months this procedure is followed on every refill.

However, I feel that 3 step bromine is the easiest and most forgiving way to maintain a tub.


As far as using muriatic acid in a tub, it is acceptable BUT because of the small water volume accurate measurements are important and that is difficult to do with muriatic acid (where you often only need a teaspoon or even less in an average sized tub) so dry acid is a bit more convenient to measure and use.