Morning!
Drinking water FC specs are 0.5-4.0 most places, but you can test your tap to see. I wouldn't worry about it too much though, I could be very wrong, but chances are it didn't add more than a couple of PPM at most. Either way, that's pretty close on the calc, and the more you stay right there the better this will go. No worries about CC yet. You haven't had FC in there long, so it hasn't had much reaction time. As for your vinyl, its great you are thinking about it, but you are safe, no worries. About 50 PPM is where you want to be careful approaching or going over. If this was mine, I would target that 23-24 every time I dosed to help keep me at SLAM value until the next round of testing/dosing. What slows you down is slipping below that minimum value. You're doin great man, and based on your post, this will go well for you. It looks like you get it, and that's half the battle for more than you would think. See how it goes later, and if you think you have debris in there, do your utmost to remove every piece. Oh, count the 48th drop, but one drop is only 0.5 as you know, so its not a deal breaker with FC. I push end points of everything to the very end so I err to knowing the high side if anything. Check your reagent stock, you may need to go ahead and order more R0871 liquid, and 0870 powder. You're going to burn through that stuff pretty quickly. Lastly, pour in the bleach as far from the edge as possible to avoid it being in contact with the liner right there. Wouldn't hurt to give a good swipe or two with the brush in that area to move it around either.