I dont think this is a problem, but I'm puzzled: I so far have NEVER had a combined chlorine level that is close to 0.5, probably not that high (super duper light pink). I have gotten in the habit of shocking every 10-14 days "just because" (and it helps bring down my persistantly high pH, too). Maybe I'm nipping any formation of combined chlorines in the bud, and that is fine, but is this normal? Water is clear, smells great, no problems except keeping pH down. Free chlorine after each dose is about 4ppm. That is estimated now, since I only measure it occasionally. I'm not complaining, since I dont want to smell chloramines, but am I missing something?