I was told at a pool store that everyone has to shock their pool about once a week in the summer. Is this true? I thought that I read somewhere that if you keep your water balanced that you do not have to do this. I have the TF-100 test kit and my chlorine is always good. I have never had any CC's. My free chlorine is always what my TC is. Now, according to test strips that I have purchased, my free chlroine is 0. I am relying on my TF-100 test kit though. My water stays crystal clear, so that works for me. I was really wondering if I need to have shock on hand.