I agree with you, shock with unstabilized chlorine (bleach or cal-hypo), keep FC at 15 by testing / dosing two or more times a day. When it's time to leave, tbas in a floater wil help you lose less ground while your gone. Unless, of course, you're completely clean, have less that 0.5 CC and lose no FC between sunset and sunup - then you're done. Well, still maybe a tab while your gone to keep up with the sun.