Hi Debby, so far everyone has told you to get a test kit, the TF-100, which is true. But we also need to help you learn what you are doing. Everything you need to know is here at TFP. For starters, click on Pool School above and try to read every article, including the "SLAM" process. They will explain pool chemistry and equipment. Then click on Pool Math, that's where you find out how much of what to add to your pool IF needed.
So far the 160 lb of salt you have added has raised your salt by about 1500ppm, most salt pools need 3000-4000, but there was likely already some salt in the pool, so as chiefwej said, dont add any more for now. The HTH salt strips i use are actually one of the few useful test strips (edit-or the test casey mentioned above)
I have a feeling you may not understand how the chlorine generator works. At the beginning of the season one adds salt to get up to the recommended level. After that no more needs to be added unless there is major water replacement done. Then the chlorine generator turns that salt into chlorine, which gets used killing germs, then it reforms salt and goes through the process infinitely.
But to clear a green pool, the generator can not produce the massive amounts of chlorine needed. For that you need to turn off the generator and use liquid chlorine to complete the SLAM process. Then you can resume the generator.
IF your pH is truly 6.8 (it may be lower, or maybe it's not accurate), it will need to be raised to around 7.2 to start the SLAM process. A top-notch test kit like the TF-100 is required to accurately test all levels so that proper dosages can be used of each chemical.
Whatever you do, stay out of the pool store. Their test accuracy and advice are equally bad.
Best wishes