HTH 52037R Pool Care Shock Advanced, Swimming Pool Chemical - Cal Hypo Formula, Prevents Bacteria & Algae, Restores Crystal Clear Water - Shock Treatment, 1lb (12 Pack)

We last tracked this at $36.16 (as low as 35% off list price) on June 22, 2026. Amazon deals rotate fast — this one is no longer active, but similar deals come back often.