Okay Ray, I googled it and found:
Inert ingredients are calcium hydroxide and calcium carbonate.
Pool shock is recommended to purify wells for human consumption.
CHRONIC TARGET ORGAN TOXICITY:
There are no known or reported effects from repeated exposure.
REPRODUCTIVE TOXICITY:
Calcium hypochlorite has been tested for teratogenicity in laboratory
animals. Results of this study have shown that calcium hypochlorite is
not a teratogen.
CARCINOGENICITY:
This product is not known or reported to be carcinogenic by any
reference source, including: IARC, OSHA, NTP or EPA.
One hundred mice were exposed dermally 3 times a week for 18 months to
a solution of calcium hypochlorite. Histopathological examination
failed to show an increased incidence of tumors.
IARC (International Agency for Research on Cancer) reviewed studies
conducted with several hypochlorite salts. IARC has classified
hypochlorite salts as having inadequate evidence for carcinogenicity
to humans and animals. IARC therefore considers hypochlorite salts to
be not classifiable as to their carcinogenicity to humans.
MUTAGENICITY:
Calcium hypochlorite has been tested in the Dominant lethal assay in
male mice, and it did not induce a dominant lethal response.
Calcium hypochlorite has been reported to produce mutagenic activity
in two in vitro assays. It has, however, been shown to lack the
capability to produce mutations in animals based on results from the
micronucleus assay. In vitro assays frequently are inappropriate to
judge the mutagenic potential of bactericidal chemicals due to a high
degree of cellular toxicity. The concentration which produces
mutations in these in vitro assays is significantly greater than the
concentrations used for disinfection. Based on high cellular toxicity in
in vitro assays and the lack of mutagenicity in animals, the risk of
genetic damage to humans is judged not significant.