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I am using test strips and a test kit but the reagents are a couple years old so that concerns me. I do not have high CYA or algae - the water is very clear! I have read lots of comments and none speak to my issue. Maybe I should have used the phrase "chlorine demand"?

Something is causing high demand for chlorine. My pool is about 15,000 gallons, vinyl liner. CYA is 30; TH is 250; PH 7.4; Alkalinity 120; TC 1; FC 0. Those readings were taken in the morning - 12 hours after adding 6 lbs. of cal hypo chlorine the evening before with the filter running...