Add salt. You need to satisfy the SWCG's sensor not some external test even if it is more accurate.
Add bleach. If your SWCG is offline, it's not adding chlorine to your pool. No chlorine - swampy pool. How long has the SWCG been off? Do you know if you have any chlorine in the pool now? Let us know and how you know. If no or low, add bleach before you go get salt.
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