Overnight drop was 3ppm from 13.5 to 10.5. Appearance this morning was noticeably clearer and bluer than yesterday - almost perfect. Also there was no rise in preasure at the filters. Hooray!!! First time it's gone more than 8 hours after a cleaning without rising. I went ahead and added about 80 oz of chlorine to bump FC back up to around 15. Was that enough? Too much?