Is it possible for a fiberglass pool to shed fibers and make swimmers itchy?
I would go a step further than the above answers and state that both the pH and total alkalinity are not in line with standards. Chlorine readings of 10 ppm should not cause itching. And unless the fiberglass pool is old and needs resurfacing or by chance has been left empty and exposed to the sun for any length of time — this could very well be a source of your itching BUT DOUBTFUL.
