Got a Taylor K2006 test kit. Having trouble with CYA test. Pool store says cya level is good but the taylor test doesn't seem to read any, water won't go cloudy at all. What might be the trouble?? Other test results follow
fc - 3.5
cc - 0
TA - 90
ph - 7.5
calcium - 250
fc - 3.5
cc - 0
TA - 90
ph - 7.5
calcium - 250