Welcome to our forum.
Elle, Switch to dichlor...LOL....I think after you get the hang of it you will find that water care is very easy. Once you get a system down you won't even have to worry about it. And don't worry if you 'screw everything up', Everyone has done it and everyone has recovered from it. Even if it comes down to a drain and fill you will make it through. Enjoy your spa and the chemical stuff will fall into place as you become more familiar with you usage, bather load, etc....
Elle,the Frog system was designed into your tub to be used with your tub. Once you get the hang of it, you will love it. I would not change to any other system until I gave the frog at least a 3 month trial and see how you like it.
Hey Elle,enjoy your spa....I just got in from mine....same tub....what color did you get.....congatualtions....