No matter what chemicals I add to my hot tub I cannot seem to make my free chlorine levels go up. It stays at zero. Been trying different shocks and such for about 3 weeks now.
Right now it says my total chlorine is good.
Free chlorine is zero
Ph is around 7.6
Alkalinity is at 140
Cya cyanaric acid is right around zero
as a side note (if it makes a difference) I am using the frog @ease chlorine/mineral system.
Any help would be greatly appreciated.