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It 100% went away with the Vitamin C test. I took a sample of my pool water and also a sample of the well water to the pool store (until my TF-100 arrives). The pool water has .4 PPM copper. The well water does not. No idea how that happened...I have no heating elements in my pool. The PH was...

Another data point, the deep part of the pool seems to be completely unaffected by the staining. I don't know what to do, would appreciate any advice!

After opening the pool, organic debris had fallen into the pool (our cover was not on correctly), and I believe organic compound had spread. It was in there for approximately 6 months. However, after shocking the pool and taking the FC up to 35 for about a day (I have a CYA of 90), I saw little...

I just ordered the TF-100. Going to take pool management much more seriously. My FC is about 4 w/ a CYA of 90. I was previously using tablets.

We have a non-salt pool, we also do not have a SWCG. The UV index for Maryland is about 7.5-8.5. As a comparison point, the midwestern states and Texas are usually about 10-12. Arizona, which you referenced in your post, is about 11-13. With this knowledge, do you think a CYA level of 90 is...

The CYA for our pool is currently 90. Our pool is in 14 hours of direct sunlight a day. Is this too much CYA or the appropriate amount? I have found sources online that state if your pool is in direct sunlight, you should maintain CYA levels of 80-100.