I have an in-line feeder too, and I only use it when I am going to be away. I like to start my pool off with a cya of 30, so that when I use the pucks I don't worry about the cya getting too high. It is nice to have as a back-up, but otherwise I use bleach. I also use cal-hypo shock to bring up my calcium, which I keep at about 125 in my fiberglass pool.