Easy to use - but chlorine levels are high

I used to pour a capful of chlorine powder every 1-2 days, after using our hot tub. But there are plenty of days we don't use it, and trying to remember the last day we added chlorine can be hard - leading to low chlorine levels. So I decided to give this dispenser a try. The levels listed in the instructions must be for a pool or something, because it's way too high. Even on the lowest setting, the chlorine levels are a little high. Test strips show between 5 and 10 ppm. We have a 500 gallon hot tub.

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