I* believe GAC is Sodium Hypochlorite (aka bleach). When NaClO is used in the water, the sodium (a stabilizer) breaks off and hangs out. The oxygen atom evaporates away, and the chlorine atom bonds to nitrogen to kill stuff. (For you chemistry nerds it looks like this: NaClO + H2O → Na+ + Cl− + 2 HO•). Over time the sodium builds up and gives a pool a salty taste and leads to people thinking its an actual salt water pool (and because they are never told correctly, that is what the lifeguards think and tell everyone else).
The eyes burning is caused by the dreaded chloramines. Chloramines are the reaction of the chlorine and nitrogen (from urine, sweat, bacteria, viruses). Chloramines are what give pools the chlorine smell, burn ices, cause itching, and respiratory issues. Good pools, such as the GAC, use UV filters to destroy the chloramines, but it's a slow process and when you stick 300 mermaids and mermen into a pool, there is a lot on their skin to kill. If you got into the GAC before everyone else does there wouldn't be any chlorine smell, which indicates a healthy pool. During the summer you might notice outdoor pools are a bit better (until all the day camps come in and pee) because the chloramines can evaporate away and be blown off the pool surface, and the UV from the sun does the same thing a UV filter at an indoor pool does.
There was a good article recently that covers this, mainly it's response in air.
https://www.swimmingworldmagazine.co...rrated-issues/
*I have been a CPO (Certified Pool and Spa Operator) for 5 years and have been working with NaClO the entire time.
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