Your pool water test readings are: $pH7\mathrm{.}8$; temperature $102$ degrees F; calcium

hardness $500$ ppm; total alkalinity $100$ ppm$,$ and TDS $3,500$ ppm$.$ What is the

saturation index?

A$.+0\mathrm{.}8$

B$.+0\mathrm{.}3$

$-0\mathrm{.}3$

D$.-0\mathrm{.}8$