Hi, Boomer,

A four pound box of Borax changes my pH about .2 My pool is 43k. One pound in your pool would make sense. Give it 12-24 hours and test. It dissolves quite easily poured directly in the skimmer (pump running) and may take effect much sooner than the 12-24 hours...I've never tested.

A comment on your CYA. It seems you will come up with a CYA of 20 using 2 lbs.....safe but perhaps a little on the light side. If it came in a 3lb container, I'd put the rest in hoping for 30ppm, Many folks run in the 30-50 range.

It also seems to me you're not dosing heavily enough on your Cl. I would recommend putting in twice that much (12ppm....maybe even 14ppm) just before dark and then testing in the morning to see how much residual Cl is left. If it has dropped significantly, I would bring it back up to the same level the next evening and again the next, until your 12-14ppm holds overnight. Then let your Cl drift down into the 3-6 range for the rest of the Summer. This will ensure your water is sanitized and not retaining any algae "bugs"

More info than you asked for, I know, but hopefully useful.