Percentage bicarbonate.
Below a pH of 8.3, the bicarbonate is becoming carbon dioxide.
Above a pH of 8.3, the bicarbonate is becoming carbonate.
CO2 + H2O <-> H2CO3 <-> H+ + HCO3-<-> 2H+ + CO32-
View attachment 547405
plot y = 100÷(1+10^(6.35 – x)) and y = 100-(100÷(1+10^(10.3 – x))), x from 4 to 12 - Wolfram|Alpha
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This can be mitigated with frequent brushing and good continuous circulation.plaster is slightly permeable and can bleed out calcium hydroxide (with certain conditions) and that can significantly affect the pool water at the immediate plaster surface.
So you are saying that I should ignore the advice that some have given to just winterize my pool and forget about it until spring? Because if I follow that advice, that means no pH adjusting, no brushing, and no circulation creating a stagnant environment with very high pH not only close to the surface but throughout this entire new plaster pool resulting in scale.This can be mitigated with frequent brushing and good continuous circulation.
The effect is mostly due to water that does not move and you get a layer of high pH water directly adjacent to the plaster.
My pool was plastered 5-3-23 ...then filled.key1cc, it is an unfortunate situation you have with your pool.
I do have a question that I am curious about. Did you your calcium hardness go actually go from 250 ppm to 625 ppm?
If so, what time span did that occur? When was your pool plastered?
Can you test your tap or fill water for the pH, TA, and CH?
I only added calcium on the dates I indicated above. On 10-22 was my 1st calcium addition hoping that if I further saturate the water with calcium it would stop leeching it. Prior to me adding any calcium the Calcium rose on its own from 200 to 500 ppm.....that I suspect was leechingIf you were adding CaCl to raise the calcium level during the summer and fall, why do you suggest that there was calcium leeching going on? Do you have an idea of how much of the calcium increase was from leeching versus CaCl additions? I agree with you that with the pH going to 8.7 indicates leeching.
CorrectI just re-read post#50 and it appears that the calcium hardness increased from 200 to 500 ppm without CaCl additions, and then you raise it higher in the fall with CaCl additons. Is that correct?
Thanks for sharing your link and the subsequent Orenda link.Okay, got it. I should have figured that out the first time I read that post.
So it appears that the calcium level increased almost three-fold during the summer when the water temp was higher and with balanced water that you were trying to maintain. Would you agree that for the most part (during the summer) that the CSI was fairly balanced even though you were keeping track of that Index at the time?
If so, I hate to be the bearer of bad news, but it would likely that the plastering quality may have lacked somewhat. This would mean that you do need to keep a slight positive CSI and also brush the plaster at much as possible during the winter. Hopefully, it won't freeze over and prevent you from doing that. In the future, when the plaster is more cured, you may not have to perform the brushing as much as you need to do this winter.
You should read this post of mine.
Why Are Calcium Crystals Forming in Pools?
In recent years, calcium crystals have been forming during the winter at a higher rate in some newly plastered swimming pools. From the reports we have heard, this problem seems to occur more often in the northeast of the country. Apparently, pool builders, plasterers, and service techs involved...www.troublefreepool.com
Yes it was mostly balanced except maybe for the 3 or 4 days I dropped the pH to ~7 in an attempt to lower the alkalinity.Would you agree that for the most part (during the summer) that the CSI was fairly balanced even though you were keeping track of that Index at the time?