Chlorine is always priority one, so add chlorine immediately to prevent any nasties from starting to take hold due to low FC.
Yes, you can add chlorine. You never want it below 2-3 ppm. I would take the FC up to the 5-7 range for this evening. It should be getting dark soon for you, so that helps with no sun. As soon as the stabilizer from the socks is dissolved, you can balance the FC to the CYA goal as noted on the FC/CYA Levels. Now after all of this, you may decide to do another Overnight Chlorine Loss Test, if not in the next day or two perhaps on the weekend, just to be safe. But with stabilizer in the water, the FC should hold much better as long as algae hasn't tried to grow.
i added in the stabilizer this morning, using the sock method. I did a CYA test before and it was showing nothing so I used pool calculator and did about 8 pounds of it. How long should I wait to retest, and what are the next steps chemical wise?
With the stabilizer all dissolved and in the water, consider it done. It should fully register in a day or two.
Unless it overflowed the pool by a foot or so, will have little effect on the CYA.
That will tell us what your CYA should be by adding 9 lbs worth. It doesn't take several days for the CYA to show. If you used the sock method and squeezed it all out, the CYA should be close to its goal in 24-48 hrs.
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Wait until tomorrow. It's best to test the CYA under a sunny sky with the sun behind you over your shoulders while you hold the viewing tube at waist level. Tomorrow will be better - weather permitting.
