CC, should I get rid of them immediately ?

0.5 CC is nothing to worry about. Just keep your FC at the top of the recommended range for your pool and you will not ever need to go through the shock process. (FYI: I say that because shocking a pool is a process and not a one time application dispensed on a schedule :)) Enjoy your pool! Looks like you are in the early stages of sparklypoolitis! :)
 
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