I've researched that and I always add Silica Blast first! I've heard there is a better product, but I bought a gallon and I've had it for a couple years now, (and it's still half full). I had just found my water report online and I've been checking it out for the last few.
Yes, I just found it! Not sure how to read it, but it does say chlorine. Here's a link!
https://acwdky.com/wp-content/uploads/2022/04/2021-CCR-Allen-Co.pdf
I had never heard of calibration fluid for a TDS meter. I always thought you checked it with distilled water.
Anyways, thanks for the well wishes!