How much salt does liquid bleach add?

[chem geek]

Another thought. Since you seem to be having a lot of outgassing of carbon dioxide, you might consider running your pool at higher pH and lower alkalinity, say start at 7.4 or 7.5 and lower alkalinity to 80. See if you still get the same amount of pH rise and alkalinity drop (after adding acid to restore the pH) as you do currently. If it's better, then this is an option for you.

The relationship between carbon dioxide outgassing is shown in the following link (CO2.png) where you can see that there is a rather large change in the relative rate of outgassing from a change in pH and a lesser dependence on alkalinity. The difference between pH 7.3 and Alk. 100 (relative outgas rate 20) and pH 7.5 and Alk. 80 (relative outgas rate 7) is almost a factor of 3 difference which may be enough for the 7.5 and 80 combination to be stable enough for you to live with. At least it's worth a try and with your current situation it should be easy enough to see how it goes. Of course, you may still bounce in pH from 7.5 up to 7.6 but you may not need to add as much acid as before.

If you try this, be sure to report back your results. I'm trying to see what sort of relative outgas rates are "tolerable" in different situations. Right now you'll see the "Limit" line in the graph at around 15, but this is somewhat arbitrary and dependent on the amount of aeration (and you have quite a lot due to the wind and rain).

Richard