No, best to remove the pucks and put them in a bucket or let them dissolve. They will add more cya.
Liquid chlorine can be found at lowes, hd, pool store it is usually 10-12% chlorine. Or buy generic bleach at grocery store, target, wm, it is usually 8.25%. Plain, unscented, not splashless or easy pour. Same chlorine, different percentages.