Skip to main content
Pool Shock Calculator/15,000 Gallon Pool Shock Calculator
Target Free Chlorine: +10 PPM

15,000 Gallon Pool Shock Calculator

Exact Dosage Chart for 15,000 Gallon Residential Pools

A 15,000-gallon swimming pool requires 1.5 lbs of 68–73% Cal-Hypo or 1.2 gallons of 12.5% liquid chlorine for routine sanitation. For heavy green algae infestations, dose 4.5 lbs (4 to 5 bags) to achieve breakpoint chlorination.

Customize Your Pool Parameters

Adjust pool volume or shock severity to re-calculate instantly.

Most Popular
Calcium Hypochlorite (73%)
1.5 lbs
≈ 2 one-pound bags

Granular shock. Fast-dissolving, adds zero CYA stabilizer.

Cleanest / Zero Dust
Liquid Chlorine (12.5%)
1.2 gal
≈ 154 fluid ounces

Leaves zero residue, zero calcium, and zero CYA. 100% dissolved instantly.

Stabilized Shock
Sodium Dichlor (56%)
1.7 lbs
Adds approx 9 ppm CYA

Includes UV stabilizer. Ideal if your pool has low CYA (<30 ppm).

Recommended Commercial-Grade Pool Shock & Brushes

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.

Check Cal-Hypo Shock 12-Packs on Amazon →Heavy-Duty Algae Brushes →

15,000 Gallon Shock Table by Water Condition

• Routine Shock (10 ppm): 1.5 lbs Cal-Hypo (1.5 bags) OR 1.2 gal Liquid Chlorine.

• Cloudy Water (15 ppm): 2.25 lbs Cal-Hypo OR 1.8 gal Liquid Chlorine.

• Swamp Green Algae (30 ppm): 4.5 lbs Cal-Hypo (4–5 bags) OR 3.6 gal Liquid Chlorine.

Why Pump Filtration Matters During Shocking

Circulation is critical. Run your 15k pool pump continuously for 24 hours after adding shock. This distributes sanitizer evenly into dead spots and pushes oxidized contaminants into your filter media.

Related Pool Shock & Chemical Calculators
→ 10,000 Gallon Shock Calculator→ 15,000 Gallon Shock Calculator→ 20,000 Gallon Shock Calculator→ 30,000 Gallon Shock Calculator→ Green Pool Shock Calculator→ Cloudy Pool Shock Calculator→ Cal-Hypo Dosing Calculator→ Liquid Chlorine Shock Calculator→ Complete Guide: How to Shock a Pool

Frequently Asked Questions: 15,000 Gallon Pool Shock Calculator

Use 2 bags (round up from 1.5 lbs) for routine shocking, or 5 bags if combating mustard or green algae.
No. The sun's ultraviolet rays break down unstabilized chlorine rapidly, wasting up to 50% of your shock dosage within two hours. Always shock at dusk.