Pool Shock Calculator
Calculate the exact amount of shock to superchlorinate your pool for maintenance, chloramine removal, or algae treatment.
Shock Calculator
Superchlorinate to oxidize contaminants and kill algae
Combined Chlorine (Chloramines)
1.0 ppm
High chloramines cause "chlorine smell" and eye irritation. Breakpoint chlorination recommended.
Pool Volume
20,000 gallons
Weekly Maintenance
Regular weekly shock to oxidize contaminants
Breakpoint Chlorination
Eliminate chloramines (chlorine smell, eye irritation)
Algae Treatment
Heavy shock to kill algae bloom
Shock Amount Needed
1.6 lbs
Cal-Hypo Shock (65%)
Tips
• Routine maintenance shock
• 1 lb per 10,000 gal raises chlorine ~10 ppm
• Add shock in evening for best results
About Pool Shocking
Shocking (superchlorination) raises chlorine levels high enough to destroy organic contaminants, chloramines, and algae. It's an essential part of pool maintenance.
When to Shock
Weekly maintenance: Prevents buildup of contaminants.
Chloramine smell: That "chlorine smell" is actually chloramines - shock to eliminate them.
After heavy use: Pool parties, lots of swimmers.
Algae outbreak: Heavy shock to kill algae.
After rain: Storms can introduce contaminants.
Best Practices
Shock at dusk or night - sunlight destroys chlorine. Run the pump for 8+ hours. Don't swim until chlorine drops below 5 ppm. Pre-dissolve granular shock in a bucket before adding.