I find that my puck erosion feeder (Rainbow 320) will more than keep up as long as the solar cover is on (or if it doesn't keep up, you could plumb a 2nd one in parallel). I often go away for 2 weeks in August and the chlorine level is higher when I get back than when I left, and the PH stays within range too. I set the timer to run my 2-speed pump on low for 12 hrs a day. I top up the water level to near the top of the skimmer before I leave so it doesn't get too low (not usually an issue as the solar cover keeps down the evaporation), fill the puck feeder to the top, and set the dial to maximum. The solar cover and the high water level also help keep most of the leaves out of the skimmer, as does running the pump on low.
I turn down the puck feeder and use mostly liquid chlorine the rest of the season so the CYA doesn't get too high.