Welcome! Yes, regular bleach is what we use to increase the free chlorine level in preparation for closing. Make sure if you use laundry bleach, it is regular. Nothing splashless, scented, and avoid the Clorox brands. Make sure to use a TF-100 or Taylor K-2006C test kit to validate. See Test Kits Compared.
More here: Closing (Winterizing) Your Above Ground Pool - Trouble Free Pool
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