Green Pool Shock Calculator
Triple-Dose Superchlorination Guide to Eradicate Green Algae
Clearing a green pool requires hitting Breakpoint Chlorination (30 PPM Free Chlorine). A mild routine shock of 10 ppm will not kill active algae; it will merely feed it. Calculate your emergency mega-shock dose below.
Customize Your Pool Parameters
Adjust pool volume or shock severity to re-calculate instantly.
Granular shock. Fast-dissolving, adds zero CYA stabilizer.
Leaves zero residue, zero calcium, and zero CYA. 100% dissolved instantly.
Includes UV stabilizer. Ideal if your pool has low CYA (<30 ppm).
Avoid cheap big-box shock with low available chlorine (40–50%). Use 68–73% commercial Calcium Hypochlorite or 12.5% Sodium Hypochlorite for maximum algae kill rate.
The 3-Step Green Pool Eradication Process
1. Lower pH to 7.2: Chlorine is 60% more effective at pH 7.2 than at pH 7.8.
2. Scrub All Biofilms: Use a stiff brush to scrape algae off walls so chlorine can reach the root.
3. Triple Shock at Dusk: Add 3 lbs of Cal-Hypo per 10,000 gallons after sunset.
Why You Must Never Use Algaecide While Shocking
High chlorine levels break down quaternary and metallic algaecides, consuming your shock and precipitating copper stains. Only use superchlorination to kill green blooms; add preventative algaecide only after chlorine normalizes.