Help with no CYA & low FC

[racryf]

Hello All,
First time using my test kit (and life-saver Spinner!) and I am not registering any CYA and an FC of 0.5.
My water temp is 55*F, so SWG not running. Have had Stabilizer in sock in skimmers for 4 days after vacuuming and backwash. My question is: Do I manually add liquid bleach, assuming I have some amount of CYA that is not registering? Without knowing my true CYA, how much chlorine should I add? We are expecting a nor' easter tonight for the next couple days so my numbers most likely will change when I check them after storm. Should I wait until after the storm to do anything?
My water is clear.
Thanks in advance for the help-and for the suggestions on this site to purchase the test kits from TFTestkits. Kits came quick with easy to follow directions. Felt like Beaker from the Muppets all morning!
Salt: 4200ppm
FC (by the FAS-DPD test):0.5
CC: 0
CYA: 0
PH: 7.8
TA:140
Calcium: 375

 

[Richard320]

Yes, add bleach. With no CYA, target 5 FC.

Your pH is at the upper limit and you have high TA. Expect the pH to climb a lot with the rain. When the surface gets pelted with rain so that it looks like it's boiling, that's aeration. I'd add a little acid to bring it down before then.