I'll second what BTDG said. Calculate your pool size and use the guide on the salt bags. Then put in less than needed, and slowly add over a few days to get it right. I would trust your SWG since it will or will not operate based on its calculation of your salt concentration.
My pool required 14 bags (40lbs) which my system measured 3200ppm (3000 optimum) and it is working great. In fact, I took a sample of water to the local pool store late yesterday since all I have is guess strips and they wanted to know who had serviced the pool since it was so balanced. Of course immediately after saying this they told me I need to buy a few "tabs" and keep one in the skimmer "just for good measures", and I should shock the pool at least once a week because it will kill the stuff that the SWG misses AND I should throw some algaecide in once every week or two. I told them thanks for testing the water, turned and walked out.
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