High pH in salt water pool?

It means you probably have a cloudy pool. First, adjust your pH level down by using muriatic acid. Follow the instructions on the bottle. Check your pH after two hours. If it is between 7.4 and 7.6, then you can add other chemicals. Also, pH will fluctuate somewhat if your TA (total alkalinity) is not correct. Raise your TA will baking soda (any brand will do). Lowering TA is a whole 'nuther story though, so be careful not to overdo it on the first attempt. Fix TA first, then address pH. Once your TA is right (about 100-125 ppm for a vinyl pool) you may find that pH has corrected itself. If not, borax brings it up, and muriatic acid brings it down.