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Skin and/or eye irritation can be caused by a number of things:

High or low pH:

Maintain pH from 7.4 - 7.6 for the best bather comfort. For chlorinated or brominated pools, use chlorine neutraliser when testing pH to ensure accurate readings.

High sanitiser/oxidiser residuals:

Maintain the free chlorine residual from 1.5 - 3.0 ppm, or the total bromine residual from 2.0 - 4.0 ppm for residential and 4.0 - 6.0 for commercial pools.

Combined chlorine (chloramines):

The total chlorine residual should equal the free chlorine residual.

Make sure that the water is balanced properly for the sanitiser type. Have a complete water analysis performed once a month and follow the ALEX recommendations.