I have been following advice from this forum for 2+ years. I opened the pool later this season than before, but, never experienced this problem. This is the first time in 2 years that my readings are not good. Please help me figure out what might be wrong. Thanks in advance.
TH=100
TC=.5
FC=.5
pH=7.2
TA=80
CYA=20
TH=100
TC=.5
FC=.5
pH=7.2
TA=80
CYA=20