Hi Kevin;
#1 - Yes, but in my experience it's a temporary fix.
#2 - Yes, so long as you use latex-free cement-only grout & thinset. Mfg may say no, however. You're better off with 'approved' continuous submersion formulas, though.
#3 - dunno.
#4 - remove and replace. I think ANY all cement concrete, no latex material should be OK so long as there are no "Not for continuous submersion" warnings.
Ben
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