We will be replacing our 12x24 soft side intex pool in about a month. We are patiently waiting on a new Discovery LX Hybrid Resin 15x30 (about 11,500 gal). We have going to have it set up with a 2 speed Hayward 1.5 hp pump and a 19" sand filter. We will have dual floor drains and a skimmer as well. We intend on running the pump on a timer 18 hrs a day. We are looking at having an auto chlorinator installed at the same time. I am wondering what to expect when it comes to our CYA levels for this size of pool? How fast will these creep up? Should I be able to simply not put pucks in the chlorinator when we want to use liquid chlorine? Basically, if we will be away for a week or so, I want to have to option to sanitize using liquid or 3" tabs.