How to Fix a Green Pool: A Central Texas Guide

If your pool turned green over a hot Central Texas weekend, you're not alone. Our intense summer heat, sudden storms, and high pollen make the Austin metro a perfect environment for algae. The good news: almost any green pool can be brought back to crystal clear — often within a few days.

Why pools turn green in the Austin area

Green water is almost always algae, and algae blooms when three things line up: warm water, sunlight, and low or unbalanced sanitizer. After a 100°F week or a big rain that dilutes your chlorine, an unprotected pool can go from clear to green in 24–48 hours. Poor circulation or a dirty filter speeds it up.

How to fix a green pool, step by step

1. 1
   Test and balance the water

   Test pH, alkalinity, and chlorine. Bring pH to about 7.2–7.4 so your shock works efficiently.

2. 2
   Brush the entire pool

   Brush walls, floor, and steps to break algae loose from the surfaces — this is the step most people skip.

3. 3
   Shock the pool

   Add a strong dose of chlorine (pool shock) in the evening so the sun doesn't burn it off before it works.

4. 4
   Run the filter 24/7

   Keep the pump running continuously to circulate sanitizer and pull dead algae out of the water.

5. 5
   Clean or backwash the filter

   As the water clears, the filter loads up with dead algae. Clean or backwash it repeatedly until clarity returns.

6. 6
   Rebalance and maintain

   Once clear, rebalance the water and stay on a consistent schedule so it doesn't come back.

When to call a pro

If the water is so dark you can't see the bottom, the algae has stained the plaster, or it keeps coming back, the underlying issue is usually circulation, filtration, or equipment — not just chemistry. That's where we come in. Our green-pool recovery service eliminates the algae, deep-cleans the filter, and fixes the root cause so it stays clear.

Serving Round Rock, Austin, and the surrounding metro, we typically have green pools swim-ready within a few days.

Frequently asked questions

How long does it take to clear a green pool?

Most green pools clear within 2–5 days with proper shocking, filtration, and brushing. Severe cases with stained plaster take longer and may need acid washing.

Can I swim in a green pool?

No. Algae itself isn't usually dangerous, but green water hides bacteria and hazards and means your sanitizer is depleted. Wait until the water is clear and balanced.