Calcium increaser (calcium chloride) can be found at the big box stores, Lowes, HD, &...... pool stores. Not sure about WallyWorld, tho. Follow the instructions on the label.
You can also use Calcium Hypochlorite (granular shock) sold at pool stores and WW for FC purposes - it will bump your CH more slowly though, but it is an option to kill 2 birds, yada yada yada.
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