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Don't spas (I think most use bromine? Mine does) deserve to be Trouble-Free too?? LOL! When using poolmath for a bromine spa, can/should I just input the bromine ppm test result using fas-dpd with r-0871 multiplied by 2.25 for actual bromine, further divided by 2.25 again for chlorine...

I'm a new user and subscriber. I see the app logs ALK-TA (total alkalinity) not ALK-C (carbonate alkalinity). As seen on the last page of the taylor treatmet guide, the taylor kit tests ALK-TA not ALK-C. Like JamesW said above, you can subtract (CYA X CYAf) as well as borates (B x Bf) to reveal...