Just as two attorneys interpret a particular law differently, so do pool guys.

I completely disagree with your pool builders start up procedure.

I start up my pools with a minimum of chlorine for the first two weeks, around 1 to 1.5ppm. During this time I'll get my hardness to 200 +or-, my stabilizer in line for the type of chlorinating system, and strive to keep my PH in the mid 7's.
You'd think that a guy with my kind of experience could tell you why, but I can't. It's just what I was taught in the late 70's by a man who'd been building pools since the early 50's.
I've taken everything he taught me as the Gospel itself, LOL.

This is how I learned about BBB, That's the thing I really loved about this website. I known this method for almost 30 years and it's always been awesome. I'll tell you guys this for fact, my pool is 120,000 gallons and is always sparkling, it's very easy to maintain good chemistry in spite of its size.

See ya,
Kelly