I finally bucked up and bought the K-2006 and speedstir. Last night was the first time trying it and I am slightly confused with the cya. The hot tub was just converted to salt.
FC - 8 ppm
CC - 9.2 ppm
pH - 7.8
ALK - 110
Hardness - 250
CYA - the black dot disappeared with 1/2" of fluid.
It is pretty clear I need to turn the SWG down to lower the FC. It also appears that have 1.2 ppm of residual. I was under the impression, since there is an ozone generator, that the ozone would knock the residual down. Or am I out in left field without a glove on that one?
The perplexing part is the CYA. After adding about a 1/2" of fluid to the tube, the black dot disappears. I know they are not great, but my hth test strips showed between 50 and 100 ppm CYA. Any idea what could be wrong?
Any incite is appreciated....