HTH™ Pool Care Green to Blue Advanced Shock is a 2 step green to blue pool recovery system designed to correct severe green water caused by algae blooms.
Advanced I delivers a powerful calcium hypochlorite (cal hypo) shock that kills algae and bacteria without adding cyanuric acid (CYA), helping avoid chlorine lock.
Advanced II is a pool flocculant that binds to dead algae and fine debris, causing it to sink to the pool floor for direct vacuuming to waste.
Used together and with the proper pool equipment, this system can turn pool from green to blue in as little as 24 hours.
It is safe for vinyl‑lined pools when used as directed and is especially effective after storms, heavy algae outbreaks, or periods of high pool use.
