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The Leisure Time Replenish Spa/Hot Tub Shock in a 2-pound 2-pack (often identified as ZCA) is a specially formulated shock treatment designed for use in spas and hot tubs. Manufactured by Leisure Time, a trusted name in spa and hot tub water care, this product offers a convenient and effective solution for maintaining water clarity, sanitization, and overall water quality in your spa or hot tub.