Quote Originally Posted by cruzmisl
TA should be adjusted to the appropriate level before ph is adjusted.
WRONG!

PH should be adjusted first. The reason is that your alkalinity will change, if you adjust your pH, and what was a problem, may not be one, once you fix the pH.

The idea that alkalinity should be adjusted first is widespread in the pool industry. There's even a trademarked slogan, "Alkalinity First!"

Can you guess whose slogan it is?

Hint: The are the largest manufacturer and distributor of sodium bicarbonate, both for industrially, and for retail sales. Hint #2: As I just discovered, they even have a BRAND of sodium bicarbonate called "Alkalinity First"

Can't guess? It's Church & Dwight, owner of the "Arm & Hammer" brand.

But, even if you couldn't guess whose slogan it was, now that you know, I'm pretty sure you can figure out why it's their slogan. I'm SURE it has nothing to do with selling you more baking soda than you need!

Ben
PoolDoc