Yesterday there was no one home to add chlorine and when I returned at 630 pm there was only 1ppm of FC left in pool after being in full sun all day long. I loaded with bleach back up to 15ppm and kept it there every hour until 12:30am. This morning at 6:30 there was FC: 11 and CC: 1.5.. so it looks like I am making slow progress. CYA is still not showing up yet.