You don't want to add 6lbs of Borax all at once. Break it up into smaller doses. Also, you don't just have to shock the pool once per day while you are trying to get a chlorine level to stick. Test it multiple times per day if you can and each time add bleach. The more often you do it, the faster you will get to the point where you can go from sundown one day to sunup the next without losing more than 1ppm of chlorine.