When you first get it, do a full set of tests.

However, with the very high chlorine levels, you'll need to modify the pH test. Purchase a gallon of DISTILLED (not "spring", not "bottled" => "distilled) at Walmart. Mix 1/2 cup of pool water with 1/2 cup of distilled water, and test the pH of THAT water. Take that reading directly.

If you have a high CYA level (sample is very cloudy after adding R0013 reagent), do another 1/2 cup of distilled + 1/2 cup pool water. Test the CYA level of that water, but multiple the result by 2.