Algaecide Pool Calculator: How Much to Use

Determining the correct algaecide dosage depends on your pool's volume and algae severity. Most pools require 2-4 fluid ounces per 10,000 gallons for maintenance, while treating existing algae may need 6-8 ounces per 10,000 gallons. Always check product labels for specific instructions.

Pool Volume Calculation Methods

  • Rectangular pools: Length × Width × Average Depth × 7.5 = Gallons
  • Round pools: Diameter² × Depth × 5.9 = Gallons
  • Irregular shapes: Divide into sections, calculate each, then sum

Algaecide Dosage Comparison Table

Algae Type Maintenance Light Growth Heavy Infestation
Green Algae 2 oz/10,000 gal 4 oz/10,000 gal 8 oz/10,000 gal
Mustard Algae 3 oz/10,000 gal 6 oz/10,000 gal 12 oz/10,000 gal
Black Algae 4 oz/10,000 gal 8 oz/10,000 gal 16 oz/10,000 gal

Application Tips

  1. Distribute evenly around pool perimeter with pump running
  2. Apply in evening for maximum effectiveness
  3. Wait 24 hours before swimming
  4. Reapply weekly for maintenance

Common Mistakes to Avoid

  • Overdosing can cause foaming and water discoloration
  • Underdosing won't effectively control algae
  • Mixing different algaecide types
  • Adding directly to skimmer