I have a new pool 18X40 Sharkline Oval (17500 gals.) that we just got filled a week ago. When I filled it the PC told me to get CYA from 0 to 40 would require about 4lbs of stabilizer which I added. I finally got a Taylor 2006 test kit and I'm still not getting any CYA. Should I add more stabilizer or does it take awhile to register?