We know that for you, whether you're a pool owner or a swimmer, health is paramount. In fact, chlorine can cause mild eye redness, but not because of its concentration in the water. The truth is that the eye and skin irritation is due to chloramines.
When a pool is very crowded with swimmers, it becomes a mixture of free chlorine, sweat, urine and other substances: this is what creates chloramines. As you know, the ailments are not caused by chlorine directly, but because the pool is not well maintained.