In the past I've asked about Ammonia in pools, and as I understand it, it is usually the result of bacteria feeding on CYA. Within the last few days, I have encountered several pools that are behaving as if there is Ammonia present. When chlorine is added, there is fizzing, and FC is eliminated almost instantly. I have also noticed that if I add pH increaser (Sodium Carbonate) there is a vigorous reaction as well.
Does anyone know what that reaction might be? I'm assuming it has something to do with the Ammonia in the pools, as I don't see it happen in other pools, but in all of the pools with ammonia issues.