Hi Everyone,
Just bought a hot tub July 27. I'm getting a bit frustrated. Went back to the lab twice at the store. PH: 7.8, T.A: 124 ppm, CH: 105 ppm, CYA 3 ppm - but F.C. is 0.09!! Can't seem to get the chlorine up. Using Lithium. Everytime I shock it and re-test it, it still shows zero on my strip.
Any advise?