Got my kit....now I have to read and make sure I test correctly. I did test the CYA and I believe it is 30 ppm, the Alkalinity is 140, the PH is 7.6, Not sure I did the chlorine correctly. Free Chlorine .24 and combined .48 . Does that sound correct? I might need to redo that tomorrow. The pool is 23,000 gal. Sand filter. 3 ft. to 8 ft. The water looks much better, but is still a little yellowish. Not pretty blue like it should be.