Hi I have recently joined your group, and I am a pool operator and look after a dozen pools.
I am British(please don't hold that against me) operating in the Algarve, Portugal and have come up against a situation.
I have recently taken on a swg pool where the lady owner has an allergy where chlorine is concerned, so hence the swg was installed.
The problem is I have a very low reading on cya 4ppm. My question is, how can I increase cya without adding chlorine into the pool? Remembering that I am operating in Portugal, and when I ask for anything regarding increasing cya, they suggest chlorine granules with a high stabilizer content. Any help would be much appreciated.