I am a newbie and am trying to learn about my new pool. I am confused about CYA and FC levels recommended in the Chlorine/CYA chart http://www.troublefreepool.com/pool-...a_chart_shock/ on this website vs the recommended chemistry for SWG pools http://www.troublefreepool.com/pool-...ater_generator also on this website. The recommended levels of CYA and Chlorine for SWG pools is 70 - 80 ppm and 3 -5 ppm respectively. The Chlorine/CYA chart states that the Chlorine levels for CYA levels of 70 - 80 should be 5 - 6 ppm. Which one is correct or am I missing something?