Green Pool Water? Here’s How to Fix It

Sea Spirit Pools

Introduction

Waking up to green pool water is every pool owner’s worst nightmare! Whether it’s caused by algae growth, poor filtration, or chemical imbalances, dealing with it quickly is essential to prevent further damage.

In Pretoria, where hot summers and high UV exposure create the perfect conditions for algae, maintaining a proper balance of chemicals and filtration is the key to preventing green water.

In this guide, we’ll explain why your pool turns green, how to fix it quickly, and how to prevent it from happening again.

Why is My Pool Water Green?

A green pool is usually caused by:

  • Algae Overgrowth – The most common cause, due to low chlorine levels and warm temperatures.
  • Poor Filtration – A dirty or clogged filter allows algae and debris to thrive.
  • pH & Chemical Imbalance – High pH levels (above 7.8) reduce chlorine effectiveness, letting algae bloom.
  • Heavy Rain or Storms – Introduces organic debris and dilutes chemicals.
  • High Phosphate Levels – Algae feed on phosphates, making water green.

 

How to Fix Green Pool Water Fast

Step 1: Test Your Water Chemistry

Use a pool test kit to check chlorine, pH, and alkalinity levels.

  • Chlorine should be 3-5 ppm
  • pH should be 7.2 – 7.6
  • Alkalinity should be 80-120 ppm

Step 2: Shock the Pool with High-Dose Chlorine

  • Add double or triple the normal amount of chlorine to kill algae.
  • Run the pump for 24 hours after shocking.
  • Use pool clarifier to bind particles for easier removal.

Step 3: Brush & Vacuum the Pool

  • Use a pool brush to scrub walls, steps, and the pool floor.
  • Vacuum out dead algae and debris to prevent it from returning.

Step 4: Backwash the Filter

If you have a sand or DE filter, backwash it after shocking to remove trapped algae.

Step 5: Monitor & Repeat if Necessary

  • Test chlorine and pH levels daily.
  • Repeat shocking and brushing if needed.

How to Prevent a Green Pool

  • Maintain Proper Chlorine Levels – Keep it between 2-3 ppm.
  • Run Your Pump for 8-12 Hours a Day – Ensures water circulation.
  • Use an Algaecide Weekly – Prevents algae from growing.
  • Check Your Filter Weekly – Clean or backwash as needed.
  • Cover Your Pool in Winter – Prevents debris and algae buildup.

Conclusion: Keep Your Pool Sparkling Year-Round

No one wants green pool water, and with proper maintenance, you can keep your Pretoria pool crystal clear all year.