Chlorine & Shock Calculator

Calculate the exact amount of chlorine needed for routine maintenance or shock treatment.

Treatment Mode

Pool Volume

Chlorine Product

Free Chlorine Levels

Routine: 1-3 ppm | Shock: 10+ ppm

⚠️ Safety Warning

Always add chemicals to water, never water to chemicals. Wear protective equipment. Do not mix different types of chlorine. Wait recommended times before swimming. Consult product labels for specific safety instructions.

Chlorine Dosage

Amount Needed
20
fluid ounces
Add 20 fluid ounces for routine chlorination. Test again after 4 hours of circulation.

Related Tools

→ Pool Volume Calculator → Water Chemistry Calculator
About Chlorine & Shock Treatments▼

Free Chlorine (FC)

Free chlorine is the active sanitizer in your pool. Maintain 1-3 ppm for daily use. Too low allows bacteria and algae growth. Too high causes skin/eye irritation and chemical smell.

Shock Treatment

Shocking raises chlorine to 10+ ppm temporarily to kill algae, bacteria, and break down contaminants. Shock at night, run pump overnight, test in morning. Wait until FC drops below 3 ppm before swimming.

Chlorine Types

  • Liquid Bleach: Fast-acting, no residue, degrades in sunlight
  • Cal-Hypo: Powerful shock treatment, raises calcium hardness
  • Dichlor: Stabilized, good for regular use, raises cyanuric acid
  • Trichlor: Slow-dissolving tablets, acidic, lowers pH

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