I've owned a hot tub for about 5 months now and a few weeks ago I refilled the water. Since I've been reading and lurking on the boards over the past few months, I made the switch to BBB. Everything is going well, I think, but I want to know what the best option would be to get as close to 0 CSI from where I'm at now.
The tub is 425 gallons (1600 litres) with a circ pump/ozonator. I have a Taylor 2106 test kit and my most recent numbers are:
The tub has a SpaFrog system in it with just a bromine cartridge, no mineral cartridge. My bromine levels are about 3.5-4 ppm between tubs.
With the most recent test settings, the CSI is about -0.24 (we keep it at 102 degrees F).
My pH is stable and doesn't fluctuate. When the TA was higher, the pH would drift up to 8 or higher - not sure how high because the scale only goes to 8. I've been using dry acid to bring the TA down and that seems to have regulated the pH.
Doing some basic calculations, I figured I have some options, but not sure which would be the best....
1) Bring up CH to about 150 which would make the CSI -0.06
2) Bring up the TA to 100 which would make the CSI -0.07 but I would be worried about pH fluctuation
3) A little of both or something else....