I had drained and refilled two weeks ago. My last readings were: Cl=0, PH=7.4, TA=120, CYA= 40, Salt =4100ppm, Hardness = 200. I know the CYA is about 1/2 of what it should be, but I had put in 4# five days ago (pool is approx 13k gall). From past experience it has taken 10 days or so to get an...