Fog,

CarlD misinterpreted your post, I think. (You used the "greater than" symbol but intended to use the (<) "less than" )

What you've done to this point is harmless enough but you need to get some Cl in the water as well.

Yes, it can all be done in one day. There'll be some differing opinions on that....many use a more careful approach. If you have tested ACCURATELY, however, you will be fine, IMHO.

Waterbear brings a good point about the Cl boosting your pH but it's been my experience the Cl will have negligible effect. I think it's about pH 11 or so and you're just not (or SHOULD not be ) adding enough to significantly modify the pH of a 25,000 gallon pool.

Dave S