My pool has been requiring 1 liter of HCL every 5 days to maintain the pH between 7.4 - 7.8. Since I don't have anything to compare to I'm wondering if this addition rate is high, low, or normal - or maybe it varies with each individual pool. I keep the TA at 100, FC at 4 - 6 and the CYA is 40. My chlorine consumption averages about 1.0 - 2.0 ppm/day depending on the hours of sunlight. There is a small leak in the pool around the overflow and I have to add water about once every two weeks. The pool volume is approx. 32,500 gal.