Thanks
@Richard320! We're on well water and all of our water passes through an iron filter that has to be cycled regularly (see last year's posts when I turned the pool orange...

-- this year I filled slowly over three days and cycled the iron filter daily) so refilling would actually be a huge pain in the butt.
Forgive me for a likely-obvious question, but I can't find seem to find a clear answer-- what's the highest FC that you'd swim at? I can skip the additional kit and just use PoolMath to overshoot 5 ppm by a bit, then add more Cl when it drops to 5 ppm (measurable with my kit). Not sure what's a reasonable amount to overshoot without risking eye irritation, etc. though. Thanks!