No worries! That is good to know. Okay, so from here on out, you'll assume your level of CYA/50 (it's best to round to the higher 10)awwheck! I'm sorry my phone broke and I'm using my sons tablet and it was giving me problems when I back spaced and needed to make a correcion.
My CYA level is 5. Not 51.
It's on there but they have no proof that I didn't take it home. The same little lady was still working and she didn't see it but they refused the refund. I wasn't going to get to mad at them because I should have made sure and I knew the girl was trying.
The Leslie's by me doesn't use test tubes. They have sealed individual testers they open in front of you so you know the water isn't being mixed with any other water. I don't know if that is different from anyone else's stores. This doesn't mean I trust the test compared to getting the TF-100.
FC/CYA Levels ~ I would aim for adding liquid chlorine (according to PoolMath) to achieve FC/6-8 ("maintenance" FC target for CYA/50)