Maintain the proper CYA/FC ratios
You don't and it really doesn't matter. If it's there it's there. Try and capture some and pour a little muriatic acid on it (somewhere safe to do so). If it fizzles it's calcium and not WWM.
WWM needs a SLAM which is nearly impossible right now so we'll have to make absolutely sure FC stays in range and hopefully that's enough. You can brush and scrub every inch though. And I'm talking every last inch, especially the hidden in plain sight ones like ladder rails, light niches, auto fills, etc.
Calcium would need you to lower the TA.
We'll hang tight for confirmation
98% of folks who sought us out like you did. Most of us were doing sucky yucky pool care before trouble free poolcare. Can confirm one is LIGHT YEARS better than the other. Things are only going to get better and poolcare will be a joke once we get you up to speed.