I need some clarification on PH versus alkalinity. I read in the forum that to lower PH and Alkalinity is the same product.
However; what would I then do if my alkalinity was high, but PH is a bit low.
Both are right on the border, but I don't understand. My Alkalinity is as high as I can comfortably have it, yet I have a heck of a time trying to keep the PH up. If I add more PH up, like I've been doing (tablespoon every few days) won't the alkalinity go through the roof?

I use bromine as a sanitizer and fill the tub with soft water, so I have had to add calcium hardness increaser to get the calcium to proper levels.

PH INCREASER (SODIUM CARBONATE)/SODA ASH- RAISES PH ONLY.

ALKALINITY INCREASER (SODIUM BICARBONATE) RAISES ALKALINITY AND PH.

PH DECREASER WILL DECREASE PH. IT WILL ALSO DECREASE ALKALINITY IF ADDED IN SMALL AMOUNTS OVER SEVERAL DAYS.

AS A RULE, ALKALINITY IS ADJUSTED FIRST, THEN ADJUST PH, THEN CALCIUM.

Sodium carbonate will still increase alkalinity as well as PH.

Having high PH and low Alkalinity (or vice-versa) is a real pain. Patience required.

Sodium bicarbonate (sodium bicarb, bicarb or baking soda) has a pH of 8.3 and contributes bicarbonate to total alkalinity. Because the spa water pH is close to the pH of the bicarb, it will have a greater effect on TA than pH. So if you want to raise just the alkalinity with a small rise in pH, use bicarb. 1 lb of bicarb added to 10,000 gallons of water will increase TA by 7.15 ppm and increase pH by about .1 to .2 unit.

Sodium carbonate (soda ash) has a pH of 13.0 and contributes carbonate to total alkalinity. Because it has a high pH, soda ash will raise both pH and total alkalinity. 1 lb of soda ash added to 10,000 gallons of water will increase TA by 11.33 ppm and will increase the pH by about 1.0 unit.

That is exactly the explanation I was looking for.

Thank you,