Total alkalinity is the most important thing (whether your pool is using chlorine, salt or bromine). It's what allows the chlorine to work ot not, (how much you will need), whether the Ph is constantly at 6.8, whether the algeacide can do its job and congtrol algea, whether your heater is protected against acidic water what eats through everything and let's not forget the bather's comfort.
Since the total alkalinity level goes down slowly, changes faster with rain, bathers, it needs to be readjusted at least once a month. Otherwise you will need lots of pH+, (unless your using a high pH chlorine sold anywhere, or a salt pool which produces a high pH level chlorine), more chlorine, more shocks, so, more money and less changes or enjoying your pool.
The ideal level for a vinyl liner pool: 125 - 150 ppm
The ideal level for a fiberglass pool: 125 - 150 ppm
The ideal level for a cement/concrete pool: 80 - 125 ppm
The ideal level for a salt pool: 100 - 125 ppm
A level of total alkalinity too high and you end up with scale.
The quantity of the product to be added depends on its concentration, the quantity of water and the actual level of alkalinity upon water analysis.
After a party or a few days of rain, an adjustment should be done.
So, total alkalinity is the 1st thing to be balanced, then the pH (since total alkalinity changes the pH).
PRO BALANCE TA+ AVAILABLE IN:1 KG, 4 KG, 8 KG, 14 KG