I came home to low CYA and FC a week ago after being out of town for a few days, the low FC was due to my chlorine metering breaking. (CYA of much less than 20, FC =.5 CC=3 ) water was cloudy. I shocked the pool and added stabilizer and thought I had it under control for a Pool Party on Sunday afternoon. After the pool party I brought it back up to shock level of 8.5+ and have tried to maintain it there for the last 5 days, however I have been loosing lots of FC per day (4.5 ppm on average), I have no CC showing on now, but my CYA is still showing less than 20 even though I added enough Stabilizer last weekend to boost it by about 15 ppm. Tonight I am adding 2 pounds of dichlor shock to boost the FC and CYA back to shock level, it had dropped to 5 ppm since this morning when it tested at 9 ppm.