CYA is a low priority. You're not swimming, so chlorine staying power isn't a big concern. Getting it full and starting the filter should be your big push now.
If you really have iron at 2.2ppm, I've seen it advised to add 1 quart of metal sequestrant for each 0.5ppm of iron for each 10,000 gallons of water. I have no experience with that or what else it might do to water chemistry, but with a new liner you don't want iron stains.
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