Where did CYA go?

ump107

0
May 12, 2014
32
Hunterdon County, NJ
When I started this whole process a few days ago my CYA was close to 90. I would estimate that I have had a 4-5" water exchange ending in 2 inches of rain as of this post. Is it possible for me to loose 10ppm of CYA with that?
My evening test results are

pH 7.5
FC 9
CC 0
Ch 100
Alk 140
CYA 60

I ran the CYA Test 4 times (dumping and refilling the tube)

Everything else seems good, is this possible with that little water exchange?
 
Yes it is. I lost 15ppm CYA in 2 days from dumping 4" of water off my pool and I expect to lose more. I started with 40 and now I'm at 25 so... It's possible. Just keep an eye on it.
 
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