Or, method three, super easy. Given good water, no issues with metals and such.

Sprinkle a box or two of borax over the water with the pump off and let sit overnight. You will notice a few lumnps, no doubt, and that they are (mostly) gone the next morning. Run the pump, optionally, brush the pool to stir any borax in solution concentration. Add acid if necessary. Rinse, lather, repeat.

As to quantity, I don't mean to disrespect our swimming pool elder, but your advice doesn't seem right. This source suggests what amounts to one 4.75 pound box per 2400 gallons. http://www.thepoolpros.com/borax.html As to calculated, I must be doing something wrong today, I keep coming up with 236 ppm at that rate. Maybe I need to align my calculator...........