Swimming Pool Shock Calculator

Calculate the precise amount of shock treatment needed to maintain perfect water chemistry in your swimming pool. This advanced calculator works for pools worldwide and accounts for all critical factors.

Calculate Pool Shock Requirements

Shock Treatment Results

Required Chlorine Increase: 0 ppm
Amount of Shock Needed: 0
Recommended Shock Level: 0 ppm
Breakpoint Chlorination: 0 ppm

Chlorine Impact Projection

Important Notes

  • Shock your pool in the evening or at night for maximum effectiveness
  • Run your pool pump for at least 6 hours after shocking
  • Wait until chlorine levels drop below 5 ppm before swimming
  • Test water chemistry 24 hours after shocking

Pool Chemistry Standards & Information

Free Chlorine (FC)

Free Chlorine is the active sanitizer that eliminates contaminants in your pool water. Maintaining proper FC levels is critical for swimmer safety and water clarity.

  • Ideal Range: 2-4 ppm
  • Shock Level: 10-30 ppm (based on CYA levels)
  • Test Frequency: 2-3 times per week

Cyanuric Acid (CYA)

Cyanuric Acid protects chlorine from UV degradation. However, high CYA levels reduce chlorine's effectiveness, requiring higher chlorine levels.

  • Ideal Range: 30-50 ppm
  • Max Recommended: 80 ppm
  • Shock Ratio: Minimum 7.5% of CYA level

Shock Treatment Types

  • Cal-Hypo (Calcium Hypochlorite): 65-73% chlorine, adds calcium
  • Sodium Dichlor: 56% chlorine, adds CYA
  • Liquid Chlorine: 10-12.5% chlorine, no additives
  • Non-Chlorine Shock: Potassium peroxymonosulfate, oxidizes without chlorine

International Pool Chemistry Standards

Parameter USA Standards EU Standards Australia Standards Canada Standards
Free Chlorine (ppm) 2.0-4.0 1.0-3.0 2.0-4.0 1.0-3.0
pH Level 7.2-7.8 7.0-7.6 7.2-7.8 7.2-7.8
Cyanuric Acid (ppm) 30-50 20-30 30-50 30-50
Total Alkalinity (ppm) 80-120 80-120 80-120 80-120
Calcium Hardness (ppm) 200-400 150-250 100-200 150-250
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