No dangers.

CYA = 100 and FC = 20 is no problem. Dermatologists *routinely* prescribe 50 - 100 ppm "bleach baths" (Google that phrase) for adult AND pediatric patients with skin problems! And that's with NO CYA present.

But, wear old swim suits. People are FAR less chlorine sensitive than women's swimwear. Ironically, the most expensive women's swimwear is the most sensitive; the least expensive is next. Mid range swim gear made by competition swimwear companies is the least sensitive.

Test your pH by mixing 1/2 cup pool water with 1/2 cup distilled water (from Walmart). Surprisingly, adding distilled water doesn't change the pH, but it does reduced the effects of high chlorine on phenol red.

Watch the videos for further info:
http://pool9.net/tk-guide/
http://pool9.net/tk-interfere/ <= explains the yellow/blue TA result