What could cause my FC number to still register high after brushing the entire pool. I applied the initial dose of bleach to the specified shock level, rechecked and brought it back up to shock. Now the last few times I've checked it the FC level is very hot pink (high). It appears there is no consumption of FC. Combined is < 1ppm.
CYA 50
Ph 7.2
TA 60
Ideas?
CYA 50
Ph 7.2
TA 60
Ideas?