48 hrs ago my fc was 8 ppm prior to hot tub use with cc 1 or less ph was 7.8 ta 60
Ch130 cya 60 borates 50
3 of us were in for 30 min so I added another 7.5 Oz of chlorine
Now 48hrs later there is .5ppm or less
Should it drop so fast? Do I literally have to check daily? What if I'm gone for a few days or a week?