table showing relationship between pH TA and CO2 outgassing

[engrav]

Hi
I saw on this website a link to a table showing the relationship of pH to TA and CO2 outgassing but...
Cannot find anymore.

Does anyone recall the link?

thank you

 

[Charlie_R]

Re: table showing relationship between pH TA and CO2 outgass

search for posts by chem geek. I believe he's the one linked to it.

 

[Butterfly]

Re: table showing relationship between pH TA and CO2 outgass

You can search "pH TA and CO2 outgassing" in the site google search, top right in menu bar.

Welcome

 

[JasonLion]

Re: table showing relationship between pH TA and CO2 outgass

Advanced Pool Chemistry. I believe you want the fourth chart down from the top.

 

[engrav]

Re: table showing relationship between pH TA and CO2 outgass

Advanced Pool Chemistry. I believe you want the fourth chart down from the top.

different chart but same data, thank you

 

[chem geek]

Re: table showing relationship between pH TA and CO2 outgass

It's this chart in table format.

 

[engrav]

Re: table showing relationship between pH TA and CO2 outgass

It's this chart in table format.

that's it! thank you

 

[engrav]

Re: table showing relationship between pH TA and CO2 outgass

It's this chart in table format.

got it, thanks
what does red / black mean? (sorry if I missed it)

 

[JasonLion]

Re: table showing relationship between pH TA and CO2 outgass

There are at least three colors involved, and I don't see any of them as black. Still, the color most like black means that outgassing will be slow, while the diagonal stripe of brighter red means outgassing will occur at some intermediate rate. While the bottom left darker red means outgassing will proceed rapidly.

 

[engrav]

Re: table showing relationship between pH TA and CO2 outgass

There are at least three colors involved, and I don't see any of them as black. Still, the color most like black means that outgassing will be slow, while the diagonal stripe of brighter red means outgassing will occur at some intermediate rate. While the bottom left darker red means outgassing will proceed rapidly.

got it, now see 3 colors, have old eyes

am at TA 100 and pH 7.4
if I drop to TA 80 or 70 or 60 to slow down pH rising will I hurt anything?

 

[chem geek]

Re: table showing relationship between pH TA and CO2 outgass

The dark color is supposed to be green. The colors delineate <10 (green), 10-20 (orange), >20 (red) which is how much the water is over-carbonated. However, the amount of pH rise is very dependent on the amount of aeration of the water so the color coding is very approximate and mostly for relatively calm pools. We have found that saltwater chlorine generator pools, for example, need a far lower amount of over-carbonation to be more stable in pH, closer to being 3 or less in the table. Finally, the rate of carbon dioxide outgassing is also proportional to the square of the TA level and that is not reflected in the table.