Joyful is dead on but ^its not actually too bad IF you hapen to be allergic to bromine and never want sanitizer to zero out. However, I suspect for OP maintaining a background bromine level would be easier
If there's a compelling reason to avoid bromine such as an allergy, its much more important to prevent ever zeroing out on hot tub sanitation than managing the cya, IMHO. In that case this is what maintaining it looks like (in my case) -- but while this approach affords the occasional miss on daily sanitation, I'd never let the hot tub sit a week without ph mgmt.
A) you use something like pentair's spa dispenser, which you can dial down to an 8th of an inch or less for slow residual release, eg 2-3 ppm so that you get about 20+ days out of a loaded dispenser that holds 7 1-inch tabs
B) ideally, you're soaking and running the jets daily (raises the ph back up a bit), on circ 24/7 (mine's auto and circulates every hour), test every other day to see if you need a bit of ph up...this avoids ph crash
C) you're willing to do partial water changes to reduce cya, which will accumulate monthly (see A...so by about 42 every 20 days)
And
D) I also add 2 oz liquid chlorine BEFORE I get in most days...normally you oxidize after, but I prefer to raise the FC before soaking due to higher cya levels that accumulate
Using this method, my skin is fine etc. Water crystal etc. I've experimented a good deal to get a balance that seems to work. Water changes in winter are a pita, but I do them or the cya gets crazy. I use a hose from inside my studio and add hot water in the deepest, snowiest parts of winter
SO that's what a working, always sanitized and not corrosive set up looks like. And the only reason I go through the hassle is because when I tried bleach alone there would inevitably be a day where I wasn't home, son plus friends would use hot tub etc. and it would zero out because more people used it than i'd dosed for. So the pita part is to ensure that others always have background sanitation even if they don't test or dose, if they're wearing suits and don't want to pour bleach, etc.
This part is important because while pseudomonas (hot tub itch) might suck the real danger of zeroing out is allowing things like legionella to grow in the pipes...a very real health hazard not to be fooled with.