If you see this in time, add 1 lb of dichlor (10 ppm on your pool) to your pool this evening, and then test your chlorine in the morning. The results will tell us of you have some sort of unresolved chlorine demand.
2 cups -- 1 pint -- of bleach in your pool is only about 1 ppm of chlorine, which will disappear very rapidly under normal conditions. A more reasonable daily dose would be 1/2 gallon, till you've gotten your pool running smoothly.
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