Tredge,

How big is your pool? The BleachCalc says that each 76 oz box adds 23.1 tetraborates to a 10,000 gallon pool. You would need about 2.25 boxes to get there. I have a 30,000 gallon pool, so I would expect to need 6.75 boxes (of course, I realize you can't buy .75 boxes, so let's call it 7).

Just curious to see if my math is right.

David