I recently changed my sand out for glass, and I'm happy with it but ever since when I do a water test, my cya is lower than it should be. Is it possible that it's filtering it out? I'm losing about 20ppm per month, and haven't been backwashing much, not ANYWHERE nearly enough to lose half my cya. I've always operated under the idea that cya doesn't leave the pool unless water leaves the pool. If it's not being filtered out, is there anything else that could make it convert to something else maybe? The loss is confirmed by both my HTH drop test kit and pool store tests.
Glass media/cya loss
- Thread starter LaVergneL
- Start date
- Jul 21, 2013
- 67,156
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Nope.
Where is Pollock?
What is your water temperature?
CYA - Further Reading
www.troublefreepool.com
I'm in central Louisiana, water temps have been 88-92 for the last few weeks. Does high water temp convert stabilizer? I haven't had to touch the water level lately either, I normally have an inch or so a week evaporation but we've been getting enough rain that it's evened out.Nope.
Where is Pollock?
What is your water temperature?
CYA - Further Reading
- May 3, 2014
- 63,161
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
From the linked article.
High pool water temperatures will cause the chlorine to oxidize Cyanuric Acid. This tends to show in water temperatures of 90+ degrees. Every 10F increase in temperature results in roughly doubling the rate of degradation.[10][11]
Chlorine breakdown in sunlight causes CYA degradation by hydroxyl radicals. This can cause a loss from 2 ppm per month to 10 ppm per month depending on the amount of sunlight the pool is exposed to.
In an area with 90+ pool water temperatures and extreme sunlight exposure 10+ ppm of CYA a month can be lost through degradation.
High pool water temperatures will cause the chlorine to oxidize Cyanuric Acid. This tends to show in water temperatures of 90+ degrees. Every 10F increase in temperature results in roughly doubling the rate of degradation.[10][11]
Chlorine breakdown in sunlight causes CYA degradation by hydroxyl radicals. This can cause a loss from 2 ppm per month to 10 ppm per month depending on the amount of sunlight the pool is exposed to.
In an area with 90+ pool water temperatures and extreme sunlight exposure 10+ ppm of CYA a month can be lost through degradation.
Thanks for the explanation. Having to replace it isn't a big deal, but I don't like not understanding the why.