I had a question regarding when to shock a pool. My understanding, which is cobbled together from information I found online, is that shocking is supposed to oxidize the combined chlorine and free it up. I also read that you should shock your pool every 1-2 weeks. I've been carefully measuring my pool and so far I have not seen any combined chlorine, so I have not been shocking my pool. Should I shock my pool even if there is no combined chlorine? Sorry for the newb question.
Also for those of you who think I'm an industrial spy (http://www.troublefreepool.com/viewtopi ... 4715#14715) bent on the fall of chemical based pools, I'm sorry to disappoint, but I'm just new to pools and trying to figure out what works best and what doesn't.
Thanks for any responses.