From what I have learned here, whatever CYA you have added this season, it's in there... they usually have a dosage chart on the back of the container. You could do a backwards calculation from that to guesstimate how much cya you have.... I only tested once at opening. Then figured out how many ounces to add to raise mine up to 30ppm, added that, so no need to test it again...as I've been using primarily bleach and a few trichlor tabs in floater that will gradually raise it over the summer. Will only need to test again at closing.

At any rate, maybe you can get a replacement product from the company if it is defective :/