Tested this morning. My FC=4.4ppm...I tested my CYA because we are going to be gone all weekend...so I wanted to sorta see where I was. My CYA doesn't register on the tube. I filled it all the way up and could still see the black dot. It was cloudy...but definitely visible. Does that mean I don't have enough stabilizer in the pool? And should I put more bleach in the pool before we leave for the weekend to keep the FC up? Please reply as soon as you can...so I know what to do before we leave! Thanks!!!