The reason for keeping PH at 7.5...
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The pH of human tears according to this paper for 20 subjects showed 7.50 (SD +/- 0.23) while this paper for six subjects showed 7.50±0.16 (SD). However, this paper for 44 subjects showed a range 6.5 to 7.6 with a mean value of 7.0.
According to this paper the pH of normal skin is in the range 5.4-5.9.
This paper talks about various factors affecting eye irritation in swimming pools. The primary factor for irritation appeared to be osmotic pressure since adding salt to the water at around 0.5% (around 5000 ppm) in the field study or 0.7% (around 7000 ppm) in the lab study virtually eliminated the irritation which isn't much of a surprise since the salinity of human tears is around 9000 ppm. The pH varying from 7 to 9 did not show a significant difference in irritation.
According to this paper the pH of normal skin is in the range 5.4-5.9.
This paper talks about various factors affecting eye irritation in swimming pools. The primary factor for irritation appeared to be osmotic pressure since adding salt to the water at around 0.5% (around 5000 ppm) in the field study or 0.7% (around 7000 ppm) in the lab study virtually eliminated the irritation which isn't much of a surprise since the salinity of human tears is around 9000 ppm. The pH varying from 7 to 9 did not show a significant difference in irritation.
I think it was the PH of human's blood that I was referring to, I read it in an article and thought to post it here. Should've been more clear, sorry.
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