I agree with aylad 100%. I have the same pool he has and assuming you will solar cover it you will thank your stars for a rectangle. Save yourself a LOT of money and plan for a saltwater pool. I use the Pentair IntelliChlor chlorine generating system. Their ad states "Turns Ordinary Salt into Chlorine Right in your Pool"
You must be here because you have heard about pool stores selling you things that you don't need. It is true. I started with a chlorine pool for 8 years and switched to softswim for 5 years and averaged $3000+ per year to operate the pool. I switched to the Pentair system 2 years ago and I am spending $500.00 per year. Also take into account your pump. It is one of the higher costs to operate. I am using an old style single speed high cost pump and am about to spring for a multispeed low cost Eco type pump. I have another post here looking for more input before I take the plunge. I wish you well on your new adventure and the key here is pool stores are for parts.