All of last summer the pool had CYA of 60ppm. Solid stabilizer was added after the pool was replastered. The chlorine usage was around 1.5 ppm per day.
After rainy winter and pumping water out periodically, I noticed the CYA level had gone down to 30 at the start of summer. I added Natural Chemistry Liquid Stabilizer, 3 cups at a time. CYA level started going up and I stopped when the CYA level was at 50. I have the Taylor Standard 50-CYA solution and verified what I was looking for. I tested for CYA at least four times over a period of three weeks, when CYA was 50. Before that I tested the CYA every other day, to make sure CYA was increasing from 30 to 50 as I kept adding the liquid stabilizer.
Now here is what I don't understand. Within the last one week CYA level is back down to 30. How is that possible? Does the liquid stabilizer disintegrate quickly in hot days? Is the solid stabilizer chemically different from liquid stabilizer?
There has been just usual summer evaporation and addition of water. Nothing unusual with respect to the pool as far as I know. The big CYA loss happened in just 4 days.
There is some urban wildlife like raccoons, skunks, opossums and feral cats in the area, but there is no evidence of them ever going into the pool.
After rainy winter and pumping water out periodically, I noticed the CYA level had gone down to 30 at the start of summer. I added Natural Chemistry Liquid Stabilizer, 3 cups at a time. CYA level started going up and I stopped when the CYA level was at 50. I have the Taylor Standard 50-CYA solution and verified what I was looking for. I tested for CYA at least four times over a period of three weeks, when CYA was 50. Before that I tested the CYA every other day, to make sure CYA was increasing from 30 to 50 as I kept adding the liquid stabilizer.
Now here is what I don't understand. Within the last one week CYA level is back down to 30. How is that possible? Does the liquid stabilizer disintegrate quickly in hot days? Is the solid stabilizer chemically different from liquid stabilizer?
There has been just usual summer evaporation and addition of water. Nothing unusual with respect to the pool as far as I know. The big CYA loss happened in just 4 days.
There is some urban wildlife like raccoons, skunks, opossums and feral cats in the area, but there is no evidence of them ever going into the pool.