This morning around 7:30 I measured around 20 FC .75 CC. Then at noon measured 16 FC and .5 CC so I added enough to get it back to 20. Then at 5:30 I just measured 11.5 FC and .75 CC. I'm in the middle of a slam, water still looks the same but I don't know where all my chlorine is going. Am I just going to have to dump 3 gallons of chlorine a day in?