CYA Is Disappearing

angheller

New member
May 13, 2024
4
Las Vegas, NV
Pool Size
10000
Surface
Plaster
Chlorine
Liquid Chlorine
Location: Las Vegas
SO last year I discovered TFP. Had CYA at 90 and struggled with algae which was a pain because of all the chlorine I had to go through.
I’ll admit over winter I didn’t really do anything…😬.
Once it started warming up I tested the pool and my CYA was at 50. When I “opened” the pool I added a ton of shock granules because I had it on hand. I’ll say about 12 lbs over the course of a couple days.

About a month later and now my CYA is less than 30 as it wouldn’t even register with my Taylor kit.

Last year when I struggled with the high CYA it seemed like the only way to lower it was by draining the pool which I didn’t do. How am I losing my CYA? How so quickly?
 

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CYA degrades over time, but that seems like a lot...only 30 days?
How old are your reagents?
Do the test again and follow these instructions:
 
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CYA degrades over time, but that seems like a lot...only 30 days?
How old are your reagents?
Do the test again and follow these instructions:
At the end of last season CYA was 90.
I just bought my reagent kit last summer.
I then tested for CYA in April to know where my chlorine needed to be and it was 50. I tested that multiple times because I was shocked it was so much lower. Now today I tested CYA again and at the 30 CYA mark I could still see the dot.